Lyle hit it right on the head; we don't hate VPN's and proxies, but we do hate the absurd level of abuse we see originating from them. The majority of those users are also using them to try to get around the country restrictions we were forced to put in place due to excessively high levels of abuse originating from those countries as well (or in at least one country's case, because we legally can't do business with anyone in that country thanks to sanctions applied by the US government).
In the end, we were left with a relatively simple choice: sacrifice server stability and allow abuse to effectively run un-checked (since we'd basically be doing nothing but fighting abuse 24/77), or block VPN's and proxies to curtail a significant amount of abuse. We chose the latter. We do investigate any dispute involving vpn/proxy usage suspensions to see if it can be lifted, but we make no guarantees that it can be.