and actually a buyer does not have to register at all to buy from either site i beleive...
one goes to froogle .. puts in a search for ones interest and a list comes up.. some items from ecrater and some from blujay... one clicks an item and then sees the price and shipping and terms in their description and sees the address and name to send a check or money order... if they trust enough they can just send it in the mail and not go further.... very very very simple..... with ecrater a seller cannot control this as much makes it harder for this fast easy sale... they have a link prominent to view sellers feedback .. makes them think and spend even more time... then they click and see a confusing feedback where they have to analyze... makes it alot more complicated... if one builds their own trust blujay will be best by far.... if a buyer needs feedback .. wagglepop has the easy to see and understand feedback..
buyers do not have to register to buy....yep sellers do.... but buyers not having to register then a site can get ALL the different needs of the all the different types of buyers.... just a bigger buyer pool to sale to...