Ah well, I'd say its their pocket, their responsibility and if I do washing and forget to check thats my excuse (although mostly I am fishing tissues out of my own pocket as I load tha machine LOL so I check so I don't get caught out myself!)
BUT I do check mostly because a) redoing clothes because of a stray tissue is a PITA, no matter where it comes from and b) stray money is MINE to do with whatever I want mwahahahahaha