Affliction, actually. My hypothesis is that they simply read down the list of pledges, which didn't indicate anything about the extras: Abomination looks like an extra figure and dice for $25, which is pretty bad on its own - although good enough for Joshua.
Others claim that fully aware pledgers were simply strapped for cash and could afford $75 but not $100. Or perhaps they could convince their parents for $75, but not $100. Perhaps abject fear of ever being in that situation is getting the better of me, but I highly doubt these.
Either way, there's 107 people in that situation, and I started a sig to remember their pain - which Skittlebrau massively improved upon.