sureshot, .cn offers coming everyday is worthless for me.
one thing i observed, few of my .in / .co.in domains i used to own till feb09 and got expired, the guy came up with the same name but with .cn extn offer in may-june'09... so they are using a little aged database
second, if you own any tld except .com, they will come up with .com offer in low xxx $. This worked very well for me as I was owning some great .net and .org but I got anoffer mail saying last date for offer such an such. I went to whois, tracked them and grabbed them (in one case only, i backordered) . So it works more like,
they are not goin to renew,,, i have a chance to grab!!
third, they offer other tld when I own .com with blah blah stories , titles like "exclusively" "reserved for you" etc...
fun, works well sometimes, annoys many a times
