That's the problem. Most don't have the tools but can easily learn what to do. Thing is, it becomes a question if you want drop 400-500 on a press, maybe skimp on the cheap side and build your own drawboard, etc... In the long run, it is worth it...Short term it's not..I guess if you plan on buying new bows or used each year, it is probably well worth it..for the guy that buys one bow that keeps for 10 years, probably not worth it.
No offense to your friend, but between you and him, who is more knowledgeable about tuning and working on a bow? I will take a guess and say it's you, could be wrong, but I find the more you know about tuning and working on bows, it's more likely they'll rather have an issue with you or you'll have an issue with them. I really believe shops like uneducated consumers above all else. They can blow as much smoke up someones *** and they won't know the difference, they can slap **** on any which way, and do anything else fast and quickly that can give the customer a poorly tuned and improperly setup bow, the customer won't even know it! If there groups are horrendous at 20-30-40 yards, they'll certainly blame it on themselves, the shop certainly would say "bad form"..Could be true, but there's a chance it could be a very poorly tuned bow, and perhaps one that has flectching contact with the rests, bad centershot, poor horizontal knock travel and a bunch of other stuff going on.. God forbid you have knowledge and question what they are doing...