Thing is to get what you really want and love. Then when your out of money and energy, you don't have to worry about selling it. Once you get to that point It will give you as much joy just sitting there.
I lucked out with the wife part, theres a mx bike in the living room and two speedwaybikes in the computer room. Not to mention my minisprint has the best parking spot in front of the house. She also knows I'm gonna blow a whole lot of money on a 410 as soon as we sell our vacation property and she cant wait.
Go into racing knowing your throwing your money away, for something that makes absolutely no sense if you think about it.