Grove owners in Florida paid him quite handsomely for the use of his bees. More than enough to cover the transportation costs
That may be feasible for a beekeeper with hundreds of hives, but if you only have a few it may not be worth it.
Additionally, while I understand that pollination of crops is vital, the transporting of beehives across the nation also spreads disease and mites across the country and that is the biggest threat to bees and beekeeping.