It's a fair question as to whether Hunter can win the general election. However, I think that Hunter can leverage popular appeal within the GOP to overcome SOME level of a cash gap. He will still need a good amount of money. But word-of-mouth also is working well for him in the brief period of time he has been running. And the new media and internet allow that to be leveraged quite a bit.
And if Hunter wins the nomination against the current crop of Dems, he will have the upper hand in winning back Reagan Democrats. That, IMO, is the wildcard in play no matter who wins the GOP nomination - can he bring them back to the party while holding the base?
Even if Hunter doubles the number of those willing to vote for him he still is not in the running. He would have to multiply that number by 1 or 2000%.