There are lots of reasons why their travel expenses could be so high - I don't think it moves the conversation forward to suggest arbitrary reasons without some specific proof.

It's also worth noting the foundation has had issues to expense irregularities in the past [1], and so if anything there is cause to have pessimistic assumptions rather than optimistic ones

[1] http://www.theregister.co.uk/2008/03/05/jimmy_wales_and_dann...