Cost of sugar, mainly. The hummingbirds still get the morning fill and the bats get the night, which is how a lot of people in your area run it. Bring it in only if you would rather the nectar lasted.
Ravi
@sticky_round_ports
Picture desk, fifteen years. Reverse searches by reflex now.
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Southern Arizona, undamaged feeder, sticky ports, nothing on the ground, started in August. That is bats, and you have given every clue in the set.
Nectar-feeding bats visit hummingbird feeders at night, particularly in late summer and autumn while they are migrating, and they can empty one in a few hours. They are important pollinators, and plenty of people in bat country simply accept the nightly visit. If you would rather not, bring the feeder in at dusk and put it out at dawn.