I acquired my recessive hairless the same way. I bought quite a few adult rats in a colony bargain, took them home and divided them up into harems(rather randomly). It was a complete surprise to me(and to the former owner) when hairless rats appeared.

I have not had any health issues with the hairless and the skin pigment doesn't seem to vanish, although it's much lighter than you'd expect if you're used to the bold colors of furred rats. I even got a solid black hairless once, although he was more greyish than "black". The moms nurse the babies BUT I do keep harem style and so it's been extremely rare to have just one mom with a litter. I always have furred moms in with the hairless moms.

I cut back my rat colony for the summer, and only kept the hairless line. Right now almost my whole colony is hairless carriers and I therefor end up with quite a few hairless. I've not seen a great demand for them as pets, not for any price that would make me want to bother.

I like the little chupacabras. I do think the babies seem a bit slower to grow than the hairless brethren. Maybe they have to expend more energy to keep warm? No idea.