This has come up before, but we might as well revisit it. Maybe creating an account can be free, but before you can send people messages, you have to fund it with $200. This is like a buyer bond, but you get 100% of it back as you purchase items. You can always withdraw it, but then you can't message anyone anymore, and the messages you sent are automatically deleted. When you get purchases totaling $200, this restriction is lifted, and you can message people with 0 BTC in your account. Perhaps there are better strategies, but one thing is clear, the SR messaging system is being heavily abused, and something should be done.