I don't know, but I can speculate with the best of them: Someone posted on a bitcoin forum that they were doing this, showing how they were bidding on spot pric

I don't know, but I can speculate with the best of them: Someone posted on a bitcoin forum that they were doing this, showing how they were bidding on spot prices etc. A bunch of people raced to get in on some free money ASAP, of whom a significant proportion neither did the expected value calculation nor realised that it was possible to rent at a flat rate! Crowd mentality, in other words.