Based on stats a few years ago, 98% of the securities on the NASDAQ are "managed" by MMs. Only 2% of the securities on the NYSE are managed by MMs. Someone else recently stated that 75% of the securities on the AMEX are managed by MMs.
Obviously, the place to be is on the NYSE. Otherwise, MM crap will continue (though not as bad as on OTCBB due to more reporting requirements).
These things I think I KNOW!
SGE