this game is like a hobby for many ppl and also for me. U buy better equipment which will help u to gain better results. Like better boots for football, better glue for models, better fishing pool etc.
U can say that those items r just pixels and u can lose them anytime. But, Its same with material things. U can lose them, they can break or some1 can steal them.
Of course there r better ways of spending money. u can buy something for ur mother or dog. Or give some for charoity. Its ur money u can do with them whatever u want!
Thats why i dont think spending money on this game is something bad.