Paying 10 times more than the rest is not smart, paying more than what you actually need to pay is plain stupid, the guy was placing orders outbidding NOBODY but himself, he could literally obtain all the hash power he needed paying only 50% or less of what he actually paid and nobody would have outbid him, that dude was paying  8.154BTC for 90PH just to get a 1 in 9 chances for the whole day, in other words, he paid 68% of the potential reward which has 11.11% chance of getting him the remaining 32% which equal 4.3BTC and thus risking 2 to gain 1  .in simple English, stupid as hell as far as the numbers are concerned.

With that being said, I don't think the person is that stupid, I don't even think they were looking for profit, it's either a money laundry attempt or a software bug.