Thinking about your business idea.
I host remotely without a co-host but have trusted a handyman to check on guest reported maintenance issues and I check the unit about every 6 weeks including prime season
I have found delightful (sarcasm) issues not reported like a broken leg on a chair (chair pieced together & pinned between table & wall so not immediately noticeable), cable box not working/needed replacement, dryer belt squeaking, mildew on wall behind clothes washer (very slow leak in pipe behind wall), noisy disposal because no one looked and cleared out the small sea shell banging around.
These are all things a casual walk-through wouldn’t catch.
The way I could see your service working is to bundle it with co-hosting services like making sure the unit is exit cleaned properly & doing an inspection. You may combine it with a cleaning & linen service.
You need an area with an abundance of short term rentals with remote owner operators.
In my area, more remote owners are moving away from rental agencies and leaping into the owner managed pool and finding out it isn’t easy.
For just the inspection service based upon perceived benefit, I wouldn’t pay $50, maybe $20.
Best wishes on figuring it out