Fraunhofer's own business plan keeps them from "getting too greedy." Besides, the very fact that you'd consider a company's pursuit of profit through licensing of patented technology to be "getting too greedy" makes me laugh at you derisively. Ha-ha.
I'd have to conjecture that he meant it in the sense that Vorbis provides competition to MP3 to keep Fraunhofer on its toes and innovating if it expects to reap profits from MP3 licensing, as opposed to the "GREEDY EV1L CAPALITISM!!!@@" interpretation.