You should really consider that at no time would Monty himself have received a wire transfer for a billion dollars. This "Monty got a billion dollars, what more does he want?!" thing is repeated all the time, but it's just not true. The MySQL companies were bought by Sun for a billion dollars, but Monty did not own 100% of the companies (or even close) -- MySQL was substantially owned by a bunch of VC companies and other executives, all of which got the lion's share of the money.

Since tax records in Finland are public, you can see how much Monty made from this acquisition (approximately) here:

http://www.iltasanomat.fi/kotimaa/art-1288338449921.html

(Ulf Michael Widenius income for 2008, ~16.8M EUR)