In this thread, the author finds no evidence of massive use of this strategy
http://bitcointalk.org/index.php?topic=2941.0(I didn't read the paper since I find it strange to ask for a payment for something that may or may not contain anything interesting; and I didn't find any hard numbers in the discussion)
Well, in the discussion, you could have seen confirmation that people who bought the paper didn't feel cheated. The reson I'm asking money first is that I don't believe people would donate, especially people who want to abuse pools. However, it's been some time since anyone downloaded the paper, so here it is, for free:
http://www.bitcoinservice.co.uk/files/111If anyone wants to donate (and that would incite me to write more about bitcoin), here's an address:
1ESWeHDPSEErzr6tcm3aToVGXKUe8kA9D8