Too many businesses for sale in one area is definitely a concern. So is too many businesses in an area not for sale. You need to determine if the market you're considering is over-roomed or under-served. The latter is clearly better.
In my search 5 years ago, I created a scoring system, which included everything from average occupancy to whether area was a 12-month tourism area or a summer-only area. Whether I would want to live in the town accounted for a lot of points, too.
I recommend looking at average rates in your area and occupancy numbers, not just from the property you're considering, but competitors. I discounted one area because I was able to go on OTAs during a peak holiday season and found over a hundred rooms available at prices below the property for sale's average daily rate.
One challenge these days to that strategy is Air. They're going to be your biggest competitor so make sure you look and see how many listings they have and what they're getting. I might have adjusted my offer price for my current property down a little had I taken into account the growth of Air and the number of listings in our area..