Here's a
Media Matters (yes, Media Matters, but it's reasonably well-sourced w/in the article) showing that it looks like that the combined expenditure for Bush's gala + security in 2005 will be roughly comparable to Obama's gala + security expenditure in 2009. Yeah, there's probably some mild "hypocrisy by omission" where some sources that gave Bush a hard time for his 2005 bash aren't saying anything this time around, but it doesn't look like Obama is spending all that much more, and inflation-adjusted, it could be less.