When you reach a certain amount of items/sales a month you become a Powerseller and depending on the amount of items you sale you get a different powerseller ranking.
When you sell on ebay, others can also see that you are a powerseller, but what are the other benefits?
Paypal Discount?
Sorry, no have a look on the paypal site though, for if you sell a lot you can apply for a discount.
Ebay Discount?
Asked a lot in the powerseller forum, but alas no, some however with a lot of persistence have managed to get an ebay mug?
Increase Ebay sells?
There have been a few tests by ebay users to see if the powerseller logo increases their sales, the answer seems to be no, not really
Additional Support?
Yes you get a new contact form and the higher sellers are given a support phone number.
Any Other Benefits ?
Well, yes one great one. You will have access to the official ebay powerseller forum giving more advice than all the ebay books and web pages combined. The only problem is extracting all the knowledge it can be overwhelming to the newbie.