So I am also using Virmach as one of my proxy providers, so far it has been working fine with no issues. The reason for wanting a proxy with a residential IP address is because each ISP has a range of IP addresses that is uses for its business IP's and a range for its residential customers. Now a datacentre or provider will also have a range of IP addresses that it uses, Jadex have most likely got the IP range of all the big datacentres and made a note of them so if anyone logs in under one of them IP addresses it knows to monitor it more carefully because it already knows its not a residential IP address and in fact it is coming from a well established business, and they aren't many reason why you would have that. By displaying a residential IP you are adding another layer of protection, like mirror mode on the client, its never going to fully prevent you from getting banned its just going to slow them down hopefully!