Trump didn't buy the Republican nomination from the RNC. They were in the tank for Jeb! He went over the party to the voters and convinced them that he was the only solution to the ills of the party and the country.
Bloomberg appeals to no one except through the purse of the DNC. It's not a winning strategy.
Bloomberg’s support for the anti-2A “Everytown” lobby org will hurt him badly in some key battle ground states like N.H. and PA.