Should you use leaks or not?

I used to own many Garry's mod servers but stopped like last year but leaks were what helped the server stay alive because some servers done have $250 to spend on addons at the start and I did buy a lot of addons after they had been tested because some addons could be brought and just thrown away because the players dont like it.
Its important as a Gmod server owner that the servers not going to be wasting money, so I think its okay ti use leaked mods and if I felt I should own the paid version of it I would buy it otherwise the leaked version would do just fine.