You must've had a 1/8th scale monster truck or something, because it's pretty hard to get a 4wd "stadium" truck or touring car style RC to wheelie.
I gave up because:
1) Money
2) Not really much fun driving it back and forth 50x doing the same thing, especially for the cost.
3) Couldn't get my damn engine to fit after I stripped a spur gear, despite the fact I had it in previously.
4) Not a big factor, but the community. IMO, it makes a difference. Half the RC car community seems to be punk 13 year old kids. The RC plane community is probably a bit older, and I'm sure RC planes are much more fun (and expensive).