StoutFiles - 12:02 pm on Jul 5, 2011 (gmt 0)
Google knew the bidding would top 4 billion, so they were just having fun by bidding goofy numbers till the price got too high. The only reason they were even bidding is to make sure they drove the price up.
If you have a limit of 3.5 billion that you're willing to spend, what's the harm in bidding Pi? It's not like they bid Tau afterward.