Apple must have just reinvented the wheel, considering it’s charging $400 to add a set of four casters to its new Mac Pro. You know, that computer that already starts at $6,000 and can be configured up to a whopping $53,000. The company noted you’d be able to get wheels for the Mac Pro way back at WWDC, but we didn’t expect quite this surcharge. Then again, we shouldn’t be so surprised, considering Apple sells a $999 stand for its $4,999 monitor.  And if you buy the fancier version of that monitor with the nano-texture matte finish, by the way,…

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