Overspending on players, coaches, etc is a natural occurence when new ownership comes in, for most NBA teams ....... Ballmer just won himself a high-profile team - he's on a high, swerte at nasama si Rivers during this happy time.
I'd have to agree that Doc Rivers' new contract is on the bloated side ....... but that's the norm in the NBA nowadays.
If noobish coaches like Fisher, Kerr & Kidd can get substantial contracts, those with extensive resumes will demand premium as well, moreso if you have dual roles within the team e.g. Rivers, SVG, Flip, etc.