Hello, Jeff here in San Antonio. I began mystery shopping in July of last year and enjoy the experience, the money, and the "undercover"-ness of it all. I do about 45-50 shops a month and have learned to self-regulate what I sign up for, and when I can do it.
I have learned some things along the way, and might throw them out here for others to use, if you feel they are worthy.
1. Go wide. I work with about 45 companies. Don't know if others have fewer or more, but I find that the more companies you have to search "job boards," the better. I have relied heavily on Jobslinger and Volition for finding MS companies, and finding out what they specialize incommunicating with several firms (I started with about 8-10 other firms that don't offer shops in Texas, being primarily East Coast or West Coast players).
2. DEFINITELY sign up for email notifications. I now check my email about every half-hour. I know there must be about 3 or 4 competitive MS right here in my very own area of San Antonio, because when I delay in opening a post and checking that firm's job board -- if there's 25-30 Texas locations a company needs shopped, two or three that might be in my area are usually gone within an hour of receiving the email.
3. Calendar, Journal, and Log. Can't stress these three enough.
When you take jobs from so many companies, it is vital you don't overbook a time slot, or that you don't find yourself at point A at 10 a.m., and then at point B 45 miles away, and find out the shop only pays $8 plus reimbursement -- you'll burn more gas than you'll earn money to pay for it.
3A -- "Calendar" is great for grouping shops in a certain region of town, and for knowing where you have to be, when, by when, and what company you are working the shop for.
I "group" my shops accordingy. For instance, I am driving to San Marcos, Texas on Saturday, a round-trip of about 120 miles, to help my son move into a new apartment.
Along the way, I am going to: 1) do an Exxon Station gas audit in one town, for one company; 2) perform three shops -- a shoe store, a clothing store, and a haircut, all with different MS companies -- at a huge outlet center up there; 3) perform a car dealership shop with a fifth MS company; and 4) take my son out to Texas Roadhouse for a reimbursed dinner, for the same MS firm that I'll be doing the car shop for.
Not only do I get to help my son, but I'll piled up $48 of shop fees, earn $38 of reimbursed purchases (a six-pack of new socks, a T-shirt and a haircut) -- and I get to take my son out to eat a meal that will also be totally reimbursed.
3B -- Journal. It's important to make notes to, and for, yourself. If a shop just seems to be more work than it's worth, note that. Record your mileage; if you make more than $600 a year from a company, you'll get a W-2, and have to declare that on taxes. Most companies take no taxes out of your pay, so the mileage "buffer" helps me soften that tax blow.
Miles are deductible, especially if you live in a highly urbanized area where traffic stops-and-starts wear down your miles per gallon. The IRS wants not only total miles, but they expect you to log monthly mileage, with odometer readings to prove the month's beginning and end.
Just get in a habit of doing this. Keep the journal in your car; every time you get in, get the journal out. Make it a habit; it'll help you come tax-time, if you end up shopping for a five-digit income this year.
3C -- Start a log. Log, log, log. You MUST know who is paying you, and how much, in order to track your wages. I use a double-bill system -- my Calendar includes: job, job address, job chore, MS company, and a "fraction" I use. The fraction consists of "payment over report due time." Here's an example of a shop I did yesterday (April 30):
CLEAR line, SA airport, Terminal B.
5 a.m. to 7 p.m.; 25/12 plus reimb.
Verify International.
The "25/12" means I got paid $25 for that shop, and that I had 12 hours' time to get the report turned in. Nothing burns your more than doing the work, and then having it cancelled because you thought you had 24 hours to turn in a report, and it was actually 12, or 8 or something.
Then LOG your shop. My logs look something like this:
4-30 Firm ABC-Chase Bank ODP 6596 FM 78, SA Due: 4-30/12 $9+ meal rreimburse Pd., XX
4-30 Company XYZ-CLEAR lane Airport, Term. B Due: 4-30/12 $25+parking fee Pd., XX date
Never sell yourself short. I have caught at least four companies in the past 10 months that unintentionally (at least I hope it was unintentional) "shorted" me money on a shop. This is especially true when a company offers "bonuses" or "rush" payments in order to get a shop done by the end of the month. ALWAYS record; and always print out a copy of the online receipt or pay page, if you can.
I hear a lot of people whining about reasing so much. But if you ever sign professional contracts, every single line of copy is important. I have had a MS thrown out because I came up one picture short, because I misread the directions. I had a "shop and compare" study thrown out, because I did the shops in the reverse order from what they specified ... on about the sixth page of the instructions. Often, MS companies repeat themselves, over and over and over and over, in the instructions. Learn to filter what you read.