How to prevent the 2000P site, after the purchase, leaving 20P

There are users reflect the purchase of a 2000 IP site, hand after 3 days, leaving the remaining 20 ip. Asked how to prevent such a situation.

seize every detail, every detail of the page,

Analysis of

Fourth, search the person’s name, QQ, look at his other website, personal credit. Pay special attention to multiple sites, other shift traffic, which had sold another jump over the web traffic can go.

fifth, see the other side of the domain name whois, site history. Basically can see a probably.

stationmaster net open Fid=73& page=1