i think a team like minny doesn't want to gamble on unrestricted FA. so, they overpaid by one year (or 2 per, if you think five years was appropriate).
two recent opposing cautionary tales come to mind: the first is deandre Jordan, whom the clippers overpaid to some degree and appear to be regretting it. the second is Tyson chandler, who got overpaid, but the mavs failed to use that money to upgrade the roster, so that didn't work, either.
I think I agree with minny's choice here. they'll never have any buying power in FA (at least not for big name players), so keeping your own talent is sort of a must. teams like Miami, ny, and la can afford to let guys walk much more than Milwaukee and Minnesota can. hell, teams that pro athletes generally seem to like living in (dallas, Atlanta, until this year, Houston) haven't been able to just hoard space and buy talent.