They'll quickly feel otherwise when they realize they have 300 bristlenose to get rid of, all their tanks have drifts of bristlenose poop and everything inside the tank is impossible to see through the brown bristlenose shingling.
Then, years later, after they're down to the last 30ish and have torn EVERYTHING out of their 400L tank so they could get every single one except the biggest pair, FINALLY don't have any more of them... SEVEN MORE OF THE *#$* THINGS!!! will pop out of who knows where as they're picking up the bags of bristlenose to take to the fish shop.
That's my experience anyway.
But, at least they're not pearl gouramis.