Well, ck isn't ONLY about trading.
You have the itrader to help distinguish yourself as a trader.
I'm probably does have a lot of sale, but that doesn't really help out the site at all unless he decides to donate a portion of that to us xD The only people who really benefit from sales are the sellers. Yes, it could be argued that it brings activity, but it's measuring different things. At the same time, lmp has 6+ guides that are on this site as well.
Trading, and prestige on a site are separate. You can JUST be here to trade, and not give a shit about any other section. Somebody could argue that that person would just be leeching off our market to benefit themselves.
If trades were made so that they rank people up, we would see an influx of people doing mass sales of shells and little things like that just to get their numbers up.
We are still a relatively new site in the whole scheme of things. It took me two years to get 400 rep on another site. I think everyone is very giving of rep here in comparison to a few other places. Maybe start lending items for avvies, help price check things, help with homework, do some graphics requests, make guides, make youtube videos showing off programs. Lots of ways to pick up some easy rep