As others say, once you reach the point of a letter of intent-- there's no way a buyer wants you carrying their LOI around to everyone in the world trying to get a better offer while the buyer is committing resources trying to get the deal done.
It's reasonable to expect a ("reverse") break-up fee, but it is not likely to be half the deal value.
It's reasonable to expect a ("reverse") break-up fee, but it is not likely to be half the deal value.