Well, It might not necesarily be double the cost for two hypers instead of one. Think of how wide the supports on MF are, if they reconfigure it, they could fit two tracks side by side on one support structure. Also, alot of money goes into contruction and labor, so if you already have the craines out on site, you don't have to pay as much to build two. I'm sure it WOULD cost significanly more to build two, but I don't think it would cost double. Besides, maybe the designers would give them a discount if they buy in bulk:)
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I'd Rather Be Riding Rollercoasters