My Husband Collects Vacuums

I know my husband tends to collect things. If one of something is a good thing than three of them must be better in his eyes. He has become obsessed with vacuums lately. LOL I try not to say anything since he cleans with them. But really, do we need a cannister, a Dyson upright, a Kirby upright and 2 cordless for a three bedroom house? LOL I think I am going to have to put my foot down if he tries to buy another one.