The biggest problem here is the risk of the JVM losing its suitability for large, scalable projects. Currently JVM on Linux is $0 in licenses. No matter what $N is, it's ∞% more than 0, and the added cost of scaling to X servers is X * N, not 0. Plus, of course, the ridiculous, soul sucking calls with a "consultant" who will try to sell you Oracle licenses and insists on being your pal and "how about I come out on Wednesday, these discussions are easier face-to-face" to actually procure the bloody licences - and then sends you an Excel sheet with 15 different term and payment options that you then have to spend an afternoon parsing. Better for a cash-strapped start up to go with something free instead.
This is exactly the reason Microsoft has a BizSpark™ programme, and Ruby doesn't.
This is exactly the reason Microsoft has a BizSpark™ programme, and Ruby doesn't.