You could reply to Dermef's argument that a purely defensive + JS/JR Center, built to fit an outside offense, would cost less than the standard Center needed for a LI offense. I think it would be interesting to see more defensive centers.
That kind of big man would be a PF, not a center. It sounds like a trivial distinction but it means that outside skills still count for the salary calculation.
Sure, you can build a defensive PF that doesn't make that much money, but the problem with that is that a) he still costs more than a comparable look inside guard and b) while you can have a look inside guard with a great jump shot for those mid-range shots that you still take with look inside, your defensive center will be severely limited offensively when it comes to those inside opportunities that you get even with an outside tactic.
The reality speaks for itself. Teams with look inside players have been the most successful teams for a few seasons now and in my opinion it's not because outside tactics are weaker but because inside tactics are cheaper and thus give you better results for your money.