I will take what you said into consideration.

Essentially, the cap rate is the proportion of Net Operating Income (NOI) to the property's value or selling price:Cap Rate = Net Operating Income (NOI)/Property ValueThis ratio offers a direct method to evaluate the yield a property generates in relation to its cost.For advanced real estate investors, integrating additional factors might prove beneficial:Vacancy rate: The duration the property remains vacant.Operating expenses percentage: Includes insurance, utilities, and maintenance costs (excludes mortgage payments, depreciation, or income taxes).The adjusted formula for net income, incorporating these considerations, is:Net Income=(100 − Operating Expenses %) ×(100 − Vacancy Rate %) × Gross Income

The valuations on them appear to be completely arbitrary and in many instances the company seem randomly selectedWe had one recently from someone else who provided the opinion and the comps were 7 miles away and from another jurisdiction - whereas this property while in a more rural area had considerable sales that could have been used.If you use them to get an idea for property condition I find them to have some value but since they have no interior inspection reports, they are at best just a random guess of the value which could be off by 100%

Texas (SA) based company so always make sure to include them in my search if they come up but ultimately have never pulled the trigger. 

And STR is much more involved with high turnover rates so you’ll not only need to post the listing but know how to keep it competitive so that you maximize bookings, of course, furnishing it, keeping supplies, restocked, cleaning, maintenance, And what about consideration to any local STR rules and regulations?  

"We've been trying to reach you about your car's extended warranty"98% probability that this is spam from some bait and switch lender who's also buying trigger leads by the metric ton.

Well this also needs to take in consideration the risk involved.

There is a post here on BP about someone doing their first flip and are in process of getting foreclosed on as home prices have dropped considerably in that area.

Before you pull the trigger on anything I would get some training or find a mentor in your area willing to show you the ropes. 

Again, this is risky, and maxing a card will ding your FICO until you pay it down, and also increase your DTI -- if those things are considerations for your next home purchase.