I get where you're coming from, in a way. But to me it's them charging for time saved not playing the game. I think the price is fine. It's not so low that people will just do it on a whim, and it's not so high as to be completely unreasonable so only those who really want to do it will pay the money.
Also, I'll admit I don't believe it will be a problem with people paying and then asking for a TLR because as you say the folks who truly don't care won't care enough about it to ask but...c'mon you seriously think NOBODY will EVER do it? I applaud your faith in humanity.
I also agree with your last point. People are terrible now after they've played it without skipping, and everyone was new once. I doubt these items will have any measurable impact on the overall dungeon/ raid experience.