It all depends on your needs and skills. I can always use extra money, but found that the multiple, low-paying, route-type job schedule was just not for me. I was 55 when I started, had a full-time college teaching job, and just was not up to the stress or physical challenges. I do have a special skill set, being a professional writer, and can often make a very good impression on an application or sample report. I discovered that for me, mystery shopping makes more sense as a way to supplement a beer budget with some champagne lifestyle experiences. So I focus on higher-end jobs, and once I got a lot of experience and knowledge about the industry I stopped taking the ones that barely pay for your time. I know that doesn't work for people who are doing this to live. I focus on hospitality industry jobs, restaurants (no fast food), and casinos (which often tie in with hotels and restaurants). I am very fortunate to live an hour from a resort area with a casino industry, and 2.5 hours from a city known internationally for its cuisine. I don't drive that distance to New Orleans even for a great meal often anymore unless I have other business in the city or a free hotel room. My son went to college there and it was great for me and my husband. Unfortunately, he graduated and now lives 800 miles or so away--no more Sunday drives or Saturday overnights to see him and live high. I know that my situation is not the typical one, but it could represent some of the great jobs you see people talking about.
One other thing that people may not think about--hospitality industry and gaming jobs take you places where you can earn loyalty points great for discounts and even freebies. I had never gambled at all prior to mystery shopping, and it was an activity I felt wary about. At first I tried to find shops that evaluated other service people and required as little time at table games as possible. (slot machines seemed less threatening) But I soon realized that it does not require a great deal of gaming to earn loyalty points, and especially to get coupons for hotel nights, meals, concert tickets, or freeplay. During slow seasons it is really easy to score such mail or email offers. You're not going to see the latest, greatest entertainment free, but especially if you're a boomer there are quite a lot of the bands from our youth who do the casino circuit and are a heck of a lot of fun--especially for free. So I decided it was definitely worth it to learn some games online and at least develop a comfort level where I'm not afraid of making a fool of myself in order to be ready for a greater variety of jobs. Of course, if you're worried about getting "hooked" and losing the family's grocery money then it's probably not a good idea--but many people can just stick to what's necessary for the shops or set an "entertainment" budget and stick to it--and even come out ahead sometimes (as long as you don't count on it).
It's fun to pick up the occasional movie theater (especially the ones that actually include the movies), bowling, or even circuses, etc. The movies and bowling aren't usually hard to get, although the movie theaters are often lengthy, detailed reports that require a lot of observed detail (all the posters in the lobbies, the trailers and commercials before the film, etc.) None of these are shops that show up all the time, and often have limiting rotations, so, as I said, it's a lifestyle thing, not a living. Also, we're mostly a "redbox" family, so being able to take one of the kids to a brand new kid blockbuster once in a while helps make me a popular grandmother!
It's also nice to be able to "splurge" for family and friends, too. I once saved my reward points at a casino I regularly shop for over a year and at Christmastime took my entire family in from out of state to the best fine dining restaurant on the gulf coast (not including New Orleans).
I know that not all of these opportunities are available in all areas, and these probably pale next to major metropolitan areas, but probably some of them are available at least occasionally in most areas.. I hope this inspires someone to be creative with what may be available to them.`. Most of the great jobs require 2-3 hour reports, which is worth it to me, and as somebody else said, if they take longer than that it's usually a matter of my state of mind or focus.