Well it IS a pain in the arse tbh. We have a goldfish which thanks to his good tank and filter has grown enormous and he now lives in a MASSIVE tank. He stinks when we change him which is not once a week!
He's thriving...looks like a trout...he's not that attractive though and I wish I was allowed to give him away!
If you are prepared to do all the work of looking after it, making sure it is fed/cleaned/tank maintained then it's not really anything he needs to get arsey about. Does he think he might get saddled with whatever chores it engenders maybe?