I understand your reasons but I really feel like trial account restrictions are over the top.  Fair enough you want to restrict spam and throwaway account abuse but there's a middle ground here where you should be letting noobs see the best your game has to offer without inconveniencing subs too much. 

* Trials should be able to join corps.  It's a social game and making friends is how you keep MMOs "sticky" and interesting.  This is the only restriction I really can't see any positives for.

* Please let us use the player market in some limited fashion!  Locking out such a big part of the game as your player driven economy is really limiting your noobs.  Maybe restrict what we're allowed to train but let us buy freely, or make us buy the cheapest sell orders wherever they are.  Some other means than a blanket ban here.

* Replying to PMs initiated by a sub shouldn't be restricted.  Obvious one here, would prevent spam but enable us to talk to people actually trying to communicate with us!

Thanks for your time.  I do intend to subscribe soon as I have spare money!