A lot of people dont have/want two hydro setups (one for veg/ One for Bloom), so its tough to keep a mommy without a veg room. A single mom (lol) in a 5 gallon bubbler under a couple of CFLS would be pretty easy to maintain, but since its already separate from the "bloomroom" for lighting puirposes, a soil mom seems a lot easier/cheaper to deal with.