From another article I'd read before (which I linked to down below, and which is gone now), the funds made quite a bit of money in the rollovers by charging a fee to every investor who wanted to roll it over. Since none of their investors actually wanted a dump truck of grain showing up in their driveway, and since the price kept going up and up and up, they paid the fee to roll it over each time.
Somebody probably did lose their shirts, but it sure wasn't the funds, and the funds won't have any trouble doing this again, because there will always be more customers eager to park money somewhere to make more money.