The following is a list of what is possible with higher reputation/trust scores:
Withdraw Capability: Can withdraw $PIXEL or other currency [1500 Reputation]
Marketplace Use: Can Buy and Sell in Marketplace [500 Reputation]
Guild Creation: You can create your own guild [1,950 Reputation]
Guild Verification: You can apply for your guild to be verified [2,600 Reputation]
Trade Threshold 1: Trading [up to 2,000 coins unbalanced] [700 Reputation]
Unlimited Threshold: No Limit on Trading [2,000 Reputation]
See how to increase your reputation here.