I think personally if you've bought seeds, they're yours to do as you please with.. To a degree.
For example with bog or karma or any of our favourite breeders, it's a big investment in time and resources to bring an 'auto from scratch' project to term. 2 years more or less, and I think as long as you give credit where it's due that's the polite thing to do.
The only thing we don't do, and that I would frown upon is the straight up copying of a strain for re-sale purposes only