Actually, it has nothing to do with being discrete LOL
The reason a member comes back to a paysite is because it looks full of content, adding smaller sized creatives for the upsells give the page they are being displayed on a 'full' feeling, despite the fact they are upsells, in the members mind, it is still content.
A page packed with 10 or so smaller graphic upsell buttons is going to be perceived as 100 times better than apage packed with 3 or 4 large creatives linking to upsells
Regards,
Lee
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