I think previewing corals has some good benefits:
- It helps out newbies. When I went to my first swap, it was overwhelming and I didn't know what to pick because I didn't have the coral knowledge that I have now after 2 years of reefing. Trying to wrap my head around what was there, I usually just ended up grabbing whatever was in front of me as time wound down. I think this can (and will) lead to newbies getting things that may not work out in their tanks.
- It has potential to help speed up the rounds. Knowing what's out there will help people make their picks faster and hopefully rounds will end quicker than the actual allotted time. Pickers can create a mental list and go down it if it was already picked.
It's not clear to me why we don't let people see what is there. If everyone was allowed to go in and pick at once, I could see there being a huge advantage, but since we pick in groups and having snaking rounds, that advantage is fairly mitigated. I could see it being a logistic issue making sure people don't do shady stuff during the preview session, but institute a "look, but no touch rule." No touching any coral containers while looking otherwise you're penalized to move to last group or you lose your first round pick or something like that.