I think most of the scammers here are too dumb to use a proxy. Most of the things I see (I work for a hosting company) are people from China, Malaysa , India, South America etc that do most of it.
For example we get a lot of order for accounts to setup phishing sites like Paypal, BoA etc and 99% of the time they route back to one of those countries. Most of them use stolen CC's which is how we catch them as the best security for online companies is doing things like checking to make sure the address and phone number on the card match the one given, checking the location of the order compared to what address the card is issued for, checking country, check if they are using a free email address, check for 'known' proxy server status etc.
Thankfully a lot of this is done automatically through a script and anti-fraud solutions such as Maxmind are setup so based on the 'score' of how many things did not match with the order you can either refuse to accept it or put it on hold until you do something like call to voice verify the order.
Unfortunately we are in kind of a transitional period now where the law does not have too much control over what goes on over the internet though I would imagine in 10 years things will be much different and it will be much easier to say get someone who scammed you on CA by contacting the local police as now a days they don't seem to offer much help.