Hi I am thinking of buying a .biz, the keyword gets 2220 hits a day from G. I want to use it to mess around with, like point 20,000 backlinks, word stuffing, covering text with CSS layers etc etc.... you know all the bad stuff. These experiments I intend to do on subdomains of this main domain. If all the black hat stuff is being doing on a subdomain can it get the main whitehat domain penalised too? Thanks
If you're going to do experiments like that it would be crazy to do it on one of your real sites, buy a cheap domain and test on that.