Originally Posted by pyroinsa
Until you fry your piston rings with a 100 shot lol
Joking aside, no, it would not be cheap to use nitrous all the time. Also, it is illegal in most states, unless this car never gets driven on public roads.
If you want to get to the legality part of it, most of the things done to cars on this site or, any site for that matter is illegal in most states.