Seems really limiting. I'm in the same situation. Trying to coordinate details of pick-up of eggs with more than one person having a 2 message limit kind of makes that useless.
I am pretty sure that people don't want to post their addresses and direct contact information in a publicly accessible forum post.
I had a very specific need, found this site, was able to get my needs met, now I am struggling on finishing the details.
I don't recall ever being informed of this 2 PM limit when I registered. Maybe, if I had known, I would have immediately asked for the users direct contact information. Which again, seems a little odd to have to do.
Might I suggest that the initial limit be raised to maybe 10 per day? It should be pretty easy to look from the back end to see if spamming is happening or not.