I've received this email today, Parked.com and all parking services that are using Yahoo feeds are no longer allowed to accept arbitrage traffic.

Dear Parked.com customers,

We were notified today by Yahoo that all Yahoo based parking companies, including Parked.com, must begin enforcing the no arbitrage/no paid traffic general provision. As a reminder, Section 2 Subsection g. in the Parked.com Terms of Service states:

"All other types of traffic including bought traffic, traffic driven by PPC campaigns, traffic directed from hyperlinks are not permitted. If your traffic originates from any sources other than type-in and search engine traffic, you will not be entitled to payment as per this Agreement. Regular checks are carried out and we reserve the right to suspend any domain from our Service at any time, on our sole discretion, if we reasonably believe that you have violated this Agreement; for example, if we suspect that the traffic on your domain is bought, generated or redirected in any way that contravenes these terms and conditions."

For more information please see http://www.parked.com/tos/.

Accordingly, all arbitrage must stop effective 1pm PST on Thursday, February 14, 2008. Even though arbitrage will no longer be allowed, all accounts will still be paid.

If you have any questions please do not hesitate to contact your account manager.

We thank you for your business and continued support.

What is arbitrage anyway?
Arbitrage is basically buying in one market and simultaneously selling in another, profiting from a temporary difference (source = investopedia.com). You can find more definition if you search the term "arbitrage" in any search engine.

This is a good or bad thing for domain investors? Well if your domain name is a not a generic or common keyword domain, then that's bad for your bottom line. But if your domain is a premium keyword, GEO domain, then it all good for you and you have nothing to worry about.

We will find out after February 14, 2008.