You may post the name Ebay, and even your username there. You are not allowed to link to your own auctions.
As far as rental prices, those are fully negotiable between owner & renter. If you've owned your points for awhile and paid little per point, they may have no issues renting their points for $10, it would cover their dues, their prorated initial investment, and a little more. If I were to rent my points, I'd rather rent to a "good" renter at $10, than a potential problem renter at $20...of course, how would you know the difference, unless you've dealt with the party before?