I wouldn't. I mean it's not that hard to test it out when you have some free time, but nobody in their right mind would do a buy it now hosting service. Maybe they rely on the security eBay provides, and they don't have to use their credit card information, they can use PayPal.
Don't bother...We tried it and majority of sales are to spammers and fraudsters. Any hosting sale that comes in from Ebay we found to have like a 75% change to come from a stolen account (Ebay, Paypal, Credit Card, etc...) and most coming from buyers with "0" reviews/points.
I saw an offer 1€ everything unlimited.
I feel pain for the people that buy this and the the "host" runs, disappear and no one else will ever know where the account gone.
Bt the fact is that are real people buying this.