I think infinite scroll is better for an experiential platform, not a transaction-based one. Haven't you ever gone home without peanut butter because what the fuck, chunky, low-fat, sugar-free, swirled with jelly, goddamn, I just wanted some fuckin' peanut butter? I once sought an orange dress in size 8 on Etsy and bought nada, because there were too many options. Infinite scroll would have made it worse, not better. Users looking to buy want what they have in mind or want to stumble across something perfect, they don't want to see 10,000,000 other things they DON'T want to buy. Infinite scroll works on Pinterest, which is mindless browsing and inspiration. It doesn't work if you are looking to spend hard-earned money on something now, today.