Let's say the buyer pays off the balance in five years.

You live in the home for at least 3 years paying more than if you were renting.  

Although 15 years is an eternity for an investor:)Why'd you pay "market price" if it needs work and under-rented?

Those areas near Orlando are pretty saturated with investors in my opinion because people want to be close to Orlando, but pay less.

By the time you pay for shipping and mistakes you will not be saving any money.

Ideally we would like to avoid paying someone's mortgage, but is investing while renting in our current location a wise move? 

There are obviously fake accounts offering ridiculous terms that stand out like a flashing neon billboard.Also, the countermeasures are pretty simple: "Don't pay anyone for ANYTHING up front!"

They aren’t moving to pay the same.

I have a stable and relatively high-paying job with savings and I’m ready to invest.

If this tenant is actually a friend, surely they'll understand your position and either pay the higher rent or find another place so you can get up to market rents.