Who cares if it's old and boring? Making money is what you need to do as an entrepreneur (by improving your product and delivering more value), not playing around with various "sexy" technologies. I would write something in COBOL if it made sense to do (i.e. faster, more efficient, w/e)

Personally I don't really enjoy the development work on the "for profit" projects I build. I love seeing a finished product, though. Use the sexy untested tech for a "fun project", not a commercial one.