How often do you play with PlantSims?

Just not interested in this version of them. They have no special features and they are only temporary.

I want to play with Plantsims...but not as they are now. Right now, in TS4, they're just a temporary status effect. That's not fun. I want to play with them, but as a fully fleshed-out lifestate. As they are now...it's just not worth the effort to unlock them.