It takes more than just post count. That will get you in the door, but does not necessarily get you any trades. Remember that many of us get to know each other through our posts, so before someone trusts you with a trade that could be worth thousands of dollars they might want to check you out and see what you've contributed to FT.

On the other hand, if someone is quick to offer you trades the second you hit your 90 posts you might want to be concerned. There are many churners on the CC who work multi-way deals that have the potential to fall apart.

So consider a hypothetical deal where you offer 60K miles for a couple of one way upgrades to international C. Let's say you buy someone a ticket that is used before you use your upgrades (it's highly unlikely that you and your trading partner are travelling at the same time). Your miles are gone. You need to know that your upgrade can be withdrawn at any time before the flight. What if the person you traded with got the upgrades from a third party that he doesn't really know? You also need to know that the agent at checkin might ask you about your sponsor. What are you going to say?

From my perspective I would caution you to get to know the game before you jump in headfirst.