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As others noted, guys travel and ISP also are localized wrongly, this coupled it means you would decline 99% of correct sales and 1% of fraud ones. Additionally, if the guy is skilled, he know how to fake the IP of correct city, so you would actually ban everyone legit who traveled, except the fraud guy.
Those IP's of him are from what ISP and cities, does it match city or no? In general only retard carders use non-isp or isp with wrong city, those I see most often use normal comcast or similar ISP from the correct city as cardholder, fine job.
I do the fraud check for cam sites, it is a little "easier" because they guy also chats and you guess who he is from behavious and slang there; also you don't get so many guys signup a cam site and spend $500 immediately, so you can monitor new signups for unlikely immediate whales. In case of yours, carder blends easier as pay once and same as everyone else... I would say if the guy is skilled with IP->city , and if cards are normal, then there's no real solution. I say cards normal.. because you can see the BIN (bank issuer) of the cards, some use neteller or virtual cards of indonesia, its' so easy to find that.. but note the banks and visa/mc are real retard because allow to write "Santa Claus" or any name and address, and the sale is approved. I had guys write John Smith's of USA approved in all billers, while card was virtual ones from islands or funny places. Visa/mc should NOT allow cards approved without check cardholder name... in ideal world.
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