How much $$$$ have you spent?
I guess alot over the years. With the project right now I would say that it takes quite a bit. But does it really matter. You invest as much money you have. Some times more sometimes less. But hey, if it's worth it it's ok I guess.
From my standpoint if you invest your own money in your car that's up to you. No other should bather. You've earned them, why should't you decide what to do with them.
And besides that there is a lot of fun and you meet alot of new people worldwide. Especially on this great site. That's my 2 cent.