That is true otos are cheap. I remember the first time I kept otos. For some reason I had no luck with keeping them alive. Then awhile back when one of the big name stores had them for a dollar I bought 10 of them and now I've kept them pretty good.
I like my shrimp because they breed easily and would be nice if my BN plecos breed again. Also I hope when my long fin BNs get bigger I can get them to bred.