Since when was Boston, which experienced a 45% increase in VC investment and which still ranks #2 in total Venture investment a NON-Coastal, low-cost city? And the top growth location is San Diego (coastal, high cost). I think the key is to look at which sectors are experiencing growth and shrinkage in VC investment and see how that correlates to the locations in which those investments are happening.
BTW, Austin - it's not doing well.