I have seen several threads in the IS forums over the last month or two where someone asks about a rash of refund notices. Do a
google search of the forum threads as IS's native search is useless. You can then look at just the last month or a date range of your choice.
My sales have been terrible lately - so perhaps that's why no refunds - but I don't recall people in the past complaining about batches of refunds, refunds going back many months and so on (except for that big
highway robbery clawback that was the subject of the conference call and a promise they wouldn't do this again.
Perhaps this is Getty practice bleeding over to iStock - any big customer calls and complains that they never actually used the images they bought and they can get a refund. I think the micro model should preclude this sort of thing (barring accidental duplicates, damaged files, flawed images, size upgrades, and so on). You buy it you keep it, whether you end up using it or not.