Not A/B test. I just use jQuery to shuffle the order. Inspired by Stripe's team page I guess: https://stripe.com/about
I only get about half the offers above the fold and some obviously look more interesting than others. I'm wondering if it would be valuable to know which offers are correlated with higher purchase rates?
Presentation of offerings from multiple partner companies is often randomized to prevent bickering between said partner companies over their positioning.
Ah, that makes sense. I didn't think of that, though I'll note that the most popular bundle I know of (Humble Bundle) doesn't seem to do that.
I'm not affiliated with Humble Bundle, but most of the offerings I've seen from them fit on a single line in the default presentation. I would be less upset about being second-from-the-right than I would be about being below the fold.
I'd hazard that it's about five minutes harder to set up that way and makes sure that each product gets equal attention space.