Adjusting the brifter rotation in or out shouldn't change anything drastic for the tape. And you can do that yourself or have the shop guy do it. It'll take just a minute or two.
Do you have the Park Tool book? or go to www.parktool.com and look up your brand of brifter. You can loosen the clamp and move it then. Just be sure to flip the hood up off the tape so you don't drag on the tape when you rotate it.
I don't know why the $25 for the used stem. If it were a Deluxe, yeah, that'd be a good deal. Maybe he thought it was a Deluxe. I don't know. I didn't buy it, though. (and if I do decide to get one, I'll order myself a new shiney purty one!)
"If Americans want to live the American Dream, they should go to Denmark." - Richard Wilkinson