$100 is not out of line at all, for a dove shoot. Just keep in mind it may turn out to be a bust, or ....... could be a barn burner. No guarantees. Would be helpful if you could scout it before ponying up, but that's likely not to be a possibility.
I've never had to pay, personally. Been to Argentina a couple times on vacation. Shot doves mornings and afternoons while there, nice accommodations, great meals and evening entertainment. But no, never paid to shoot doves.
Spent tens of thousands over the last 40 years planting dove fields, but never paid to shoot them.
Bought out of state licenses for doves, but never paid to shoot them.
Can't imagine anybody doing that ............
