You're not a bad owner hun. If you think, breeders like myself have multiple hammies and if we got every single one out every day for an hours playtime...well there wouldn't be enough hours in the day. Also not every hamster WANTS to be out every day. Some of my Chinesey's are there waiting for cuddles every day, some of them prefer to be left alone and gotten out every other day. You gauge it on each animal and what they personally want/need. As long as they have everything they need and vet care when they need it (which you've said they do) as long as they're not left in the cages 24/7 and never get any attention then don't worry
