Well the port must be filled in, 1080 is the default probably if you inputted null. If you enable a proxy and It's an invalid one you'll receive a socks error, so the client won't work.
Normally It'll reflect the IP in the title of the client.
The top gold buyers literally buy for like .60$/M and they re-sell like .80-1$/M. If a few do this and want to sell their investment faster then they go lower and basically crashes the price. This isn't the small change we're talking billions. Who can blame them they put $15k in osrs gold and don't want to be hit by Jagex.
microleaves is good. But It's $125/month however you can select the countries for each one and they have quite a lot of IPs. Personally unless you actually need a lot yourself I wouldn't recommend doing it due to the costs involved (don't forget computing power costs)
Thanks for the heads up, good to see Jagex hired another Anti-Cheat guy. As long you bot when the main guys are sleeping your chances of not being banned is pretty good.
Just my conspiracy theory