Many affiliate program's have their link-codes like this:
http://domain.com/reftracler=ID
and ID = username in 50-60% of the cases...
I really don't feel good about people knowing my user-name..
They can take a brute force script + word-list.. and its just a matter of time before they have access to my account = my money
I like NATS because they encrypt the link -
thanks guys... I wish more Programs would do the same