Thanks katie@ebay . As the offer page functions in the same way as a normal search page, I don't understand why there are only a few selected sellers allowed on it? They're not chosen for being better sellers than those excluded so what's the reasoning?

It's not due to space constraints so I don't get why ebay don't want buyers to see most of the discounted items. Surely, if a seller is invited to participate, it would make sense to treat all sellers the same in terms of visibility, instead of steering buyers to just a chosen few hugely limiting their options. Also, this favouritism isn't made clear when you accept the offer. It gives the impression that all sellers will be shown to be part of the offer to buyers.