Make money or lose money? it is only money. As a hobbyist I look at the FUN factor and get paid back in smiles and laughter.
Pinball is a luxury to own and should be treated as such.
If you want guaranteed returns, put it in the bank.

Man, if you could see my pins! some really unoriginal things I have done to them. Spare bits were just not available. But I did not make them worse.
 
Go for it dude if it gives you pleasure, could even become the latest thing to do if people like it! just like modding?