$300 fee? No, my friend. If you buy something on MLS, you pay at least half of a 6% commission on that $300k, for a cool $18,000 (if you have an easygoing seller, that is) How's that for a barrier to entry?

And yah - the market would revolutionize overnight* because without professional licensing suddenly MLS becomes just one of many sources of data - and judging by the technology of MLS, a quickly irrelevant one.

* - I exaggerate: it would take at least a fortnight.