Maybe HE doesn't have anything to lose. But he would be screwing over his son.
And really...what would he gain? He is NOT going to get the nomination. Plain and simple. He knows this. He wants to be heard. And issing off the GOP, thus pretty much getting him shut out at the Convention would be the worst thing to do.
And again...seriously...while many Ron Paul supporters won't vote for the nominee (most will, by the way...come back to reality...not every one voting for Ron Paul is rabid.) well..the reverse is also true. Romney has FAR more supporters...and many of them would prefer Obama over Paul, so Obama would easily win.
They are both pollin the same against Obama...about 2 points back, but within the margin of error. If one tried to use that tactic, and the other did as well, neither one would have any chance of winning.