I am sorry you are having problems with other RCU members.

As you stated, it is easy for problems like this to occur anywhere on the internet so leaving RCU and going somewhere else will not solve the problem. Trades are inherently risky. I have stated this many times. If you do not know the person, I would not recommend trading with them. Instead, only deal with money. Use Escrow.com to handle the transactions (they will not broker a trade). If the other party does not want to use Escrow.com yet they still seem trustworthy, use Paypal. If you must trade, do it in person.