It artificially generates traffic to a domain, and where the owner to sell the domain, the traffic and revenue would not be a true reflection of the actual domains revenue stats.
No matter how you package it, it will always be fraudulent.
if I decide to sell it will sell it as a pair (leeting the buyer know that the typo redirects to the other name - although I never sold such names)
The reason doing this is that the typo may take longer to opt, any forwarding is done on the PPC, the PPC is reviewing my account every month and never had any issues for 3 years now.
I agree in general that you must
NOT redirect traffic, As I said in some rare cases where there is a typo of same traffic would not be a problem.
e.g. I don't redirect cheapholidays.de to cheapholidays.com , although similar names the traffic is different and the .de name will have difeerent advertisers.
You see many "sales" threads here with many uniq type-ins per day...even if you test the traffic the scammer will be forwarding other names to the one you are testing. There is no possible way to find out that is redirecting traffic, the referrer is not shown anywhere so you thing is type-in. Few weeks after you buy the name you will see the traffic going away. If u contact the buyer will say that you bought it at your own risk and this has nothing to do with him.