It may be that you are mostly shopping for the really big MSCs where the schedulers do not have any time for, or interest in, making connections with shoppers. The medium sized and smaller MSCs seem to be better for building relationships. Most ACL schedulers seem to welcome interactions with shoppers, as do the schedulers for all but one of the video MSCs. But, if you are looking to become a favorite of someone at a place as large as MF or Intellishop, you are probably out of luck.
For shcedulers who are "approachable, of course "please" and "thank you." But also, remember that they mostly hear from shoppers when things go wrong or from angry shoppers. So, try sharing a fun or funny or triumphonat shopper moment with them.
AND, it is very important to create a sig line for all of your scheduler emails that makes you memorable in a good way, states your name, area, specialty (if any), willingness to travel and/or take last minute shops. This is your business card in a cyber world!
Example:
Sam Shopper,Shopping the West Boondock area from Toe to Heel since 2009
Willing to travel for your hard-to-fill shops
I love convenience store shops!
phone number
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.