who can tell me why some sellers can use the private bidder option, while others can't?

[motomaniac99]

I wanted to use this option for my bidders, but ebay said I couldn't...yet I just looked at an item I was bidding on, and the other bidders under private bidder clause...??????

[heidilynn0_3]

Hi flapfacks .. I am unaware of any block on private..

http://pages.ebay.ca/help/sell/private.html