where have you advertised southperry?

Lolbasil.

I don't straightforwardly advertise it, but I go around, post in all the data and formula related threads and say "it's on SP.net" plus a brief 1-line answer. Sooner or later we get a bunch of people that know of "SP.net", even if they don't know the actual URL. And sooner or later, they find out and end up here.