I doubt (as you've stated) that anyone but a car guy or gal would want to pay extra for a house that has those in the garage. Think about it, when was the last time you saw a 2 or 3 car garage in the middle of suburbia, that has 2-3 kids living there that at least 75% of the garage space wasn't filled w/ crap? Most people use a garage for storage of junk anymore it seems, not for working on their cars like us. I know I personally may pay a bit more for it, but my wife would be like "WTF do I need THAT stuff for just to park my car on it?"
Stick w/ the kitchen and bath remodels. Seems to be a safer bet. And if it comes down to it, whomever is looking to buy it in the future from you doesn't want/need/like the tiles, then I'd take 'em with me.
Just my .02
These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.