If you think about it, if this became the norm, nobody would ever throw their hat into the ring again. Why bother? It wouldn’t be worth the sacrifices of your family and time.
The big cheeses would always pick the candidate at the convention and that is who you get.
Geesh
How so? Any candidate who manages to amass a majority of votes by the Convention wins, and there is no contest or dispute at the Convention. That's plenty of incentive. The problem is that, at least to this point, nobody has been able to demonstrate that they can consistently get majority support.