I've done one, highly bonused, and it took me almost an hour because it was my first time. I'd do another one, but only when there's a whopping big bonus. The only location near me that gets bonused is almost 45 minutes from here, which is the one I did (mostly to get the practice) and rarely gets up to where I need it to be in order to do it. The fee was worth the time in-store, but not with the travel.
My local locations don't seem to be shopped at all anymore, and the next nearest store is about 30 minutes away. That one doesn't get bonused, though. I asked for one last time, and one was extended, but not enough unless I could find another shop to tag onto it. Which I couldn't.
I can't imagine doing these for base fee, even if I had a good system in place and the store was just down the road.
I learn something new every day, but not everyday!
I've learned to never trust spell-check or my phone's auto-fill feature.