scanman 1, I'm glad you posted your comments. I hadn't really thought about the fact that these businesses are using inexperienced people to get their data more cheaply. That's a really good point, enough to make me decide that I won't mess with them any more. I appreciate your bringing that up.
As far as being outed, when I did the one EasyShift I was careful to avoid being noticed by staff in the store (but of course you never know). I found that doing that was actually harder than conducting the mystery shops I've done at that same store.
So, having considered points 2 & 3, I'm deleting the two apps.
As for your first point, and this applies to lots of smartphone stuff, I only keep location on when I need it, so that helps a lot as far as draining my phone's battery. The other thing I do is use the Battery Doctor app, which optimizes everything on my phone to reduce battery consumption - it keeps apps like EasyShift and Field Agent in their place, not sucking up the power. In fact, for anyone who has a smartphone and thinks the battery is being drained too quickly, it's worth taking a look at Battery Doctor or one of the other highly rated power saving apps out there. Aside from reducing consumption, it helps manage the battery charging in your phone so that (in theory, anyway), the battery life expectation improves.