Probably because it's 15$ dollars tier, lmao... I wonder if there's a mathematician among us to count the minimum and maximum of 15$ tier patrons with 966 patrons and 4098$ donations total. Tiers are 1$, 5$, 15$, 25$ and 50$. Assuming nobody donates higher than 15$, then what is the maximum amount of 15$ tier patrons? Then we can take the middle number between 0 and X to assume how much of them are even able to play it.
If this was a usual data set, then it would be a decent rough guess to say that about 80% of the patrons pay $1. That leaves around $3330 for the other 193 patron and this group would average around $17 each. Again, usually around half of these would be in the $5 group leaving the $15+ team at about 80-100 member but with an average payment over $30, so there are probably a few big spenders left at the top.
I must stress that this is not a real calculation, i made big assumptions, i don't have the data and the set distribution is probably not usual anyway, especially the $15 group could be way bigger since everyone knows that they get the update first. As i'm writing this i know at least a dozen ways to attack my own calculation, so please don't use it seriously.
That being said, if about 100 people got access to the update and late night release delays the access of europeans, americans and afrikans especially, then having only a few dozen people who already downloaded and tried the update is not strange. I mean even on this forum there was a grand total of 1 guy who played thorugh it so far.