Here are my 2 cents. I've posted many pictures of plants over the years and added photos to the data base. I occasionally raise a question and add my thoughts to someone else's post. I have also just asked someone if they were willing to trade for a plant I really want. As an example, I have asked certain folks for specific Bud Bennett intros that I don't grow and tell them the reason why I really want that plant. We have either been able to work out a trade or I was able to purchase the plant from them. I always feel "Nothing ventured, nothing gained." Many of us on these sites have been "burned" in the past with trades and purchases off the Lily Auction. I used to belong to the Daylily Trademart many years ago and it ran twice a year. It was a fun group and everyone posted feedback about the plants they received, so everyone knew who the good trading partners were. We were all invested in getting good plants, so we sent good plants. My rule of thumb is to send plants I would like to receive. I also have some large established clumps and they are a pain to divide, but if there is something I really want, I will bust up the clump.
I usually post a sales list in the classifieds and that is a way to also earn some trust with the members on this site. I have a few regular customers. Be on the look out for my list in the near future. I need to make some room for seedlings and plants that are in pots.
David