Money is not a huge motivator for Notch... back in March of this year, he gave seven figures ($3 million) of his personal dividends to his fellow Mojang employees:

http://www.develop-online.net/news/40013/Notch-gifts-3-milli...

Given his taken on money — and that Notch has taken a very public stance against participating in helping to close the PC — it is very unlikely that a fat cheque would result in a change of his actions. Time will tell, I suppose.