I seem to notice click thru rate about 300% + higher when using mouseovers on sponsor links (making it look like the link just goes to the root domain). Especially with those which look obvious - such as ccbill affiliate codes/urls.
Does anyone else see this?
Also when a sponsor uses affiliates codes in the form of:
http://rootdomainname.com/myaffiliatecode/
The difference is drastic.
Why do more sponsors not make use of this?