Samson, congrats and your thoughts hold true because that is what's going on in Florida, especially the Orlando area. You're selling a business so you can base the price off of the cash flow, so like others have mentioned, you'll need a longer track record (winter months).
People sell turnkey rentals, win/win for buyer & seller, they are doing the same with STR (short term rentals). Still at the ground floor for STR ( people will say 5 or 10 yrs from now, "I wish I got in when it was still good!"). Selling turnkey STR will grow right along with the STR industry, which is starting to come together a bit, as an 'industry', successfully lobbying/educating some municipalities into allowing STR!
Check out the STR forum here on BP!
Check out Heather Bayer (awesome podcasts about STR) and Matt Landau (STR mastermind). Also, they both advocate setting up your own website & cut your reliance on the 'hosting websites' since you don't know when they will change things on you!
As your slow season approaches, look to Realtors for clients needing housing between homes and look into workers on a temporary gig from another city, especially if you are near some large corporations or a hospital.
I'm in the process of closing on a vacation rental up here in WI myself, located on the Wisconsin River, and plan to buy a couple more (will rent for $200 to $300/ nite). Skiers/snowmobilers in the winter, kayakers/canoers, musky fisherman, 'up north experiencers' in the summer.
I think you've got a great idea, just pick your properties/locations wisely.