This is a tough call...
On one hand, I enjoy forums that have a non-commercial bias. It allows us to discuss our buying experiences, trade notes about the best nurseries, etc. However in the case of BonsaiNut, we have a fair number of members who are also nursery owners/employees. These folks are probably reading some of these threads and thinking "we have a BUNCH of trees that would work for these folks - but we can't talk about them".
Here's what I am willing to do. Each seller/business that wants to advertise or list trees on this site can send me a PM. Assuming they meet my rigorous quality standards
)), I will set up a special board for them within the Sponsors Forums section. This will be their area to talk about their wares, answer specific questions, etc. It will allow them to have a home separate from the public forums and yet still on the site. We can see how it goes, and change it if necessary down the road.