And 10% is rich, but fair.

But buying without any inspection is rare.

Like @Bruce Woodruff I prefer VRBO guests but I haven't had terrible luck with AirBNB guests.

Again, I speak from experience. my limited experince at this is a trier of fact will side with the land owner most all the time.I bought a tax sale prop in CA .. these are tax sales not tax certs. 

It may feel cumbersome, but their diligence reflects the level of security and service you can expect once onboarded.

But presuming you are talking about doing the above, this is a high risk strategy.

I’m not sure you could really scale a STR on Shopify but you could always start there and migrate to another platform. 

It's slower, but patient people tend to make wise investments.

Zillow and OpenDoor attempted to use software to predict the sale price of properties and their results were/are bad because their software was poor and the inherent limitation of software to deal with subjective data.

A bit after the fact but maybe find some use of the info.