But most are legit and aren't out just to scam you.

Once young people focus on something else or aren’t willing to devote the work needed for RE it will die down.

Is there something I should do due diligence to avoid any fraud/scam?

A nonconforming use is a use of land, buildings, or structures that was lawfully established prior to the effective date of this ordinance, or any amendment thereto, but which does not conform to the regulations for the zoning classification in which it is located.Nonconforming uses may be continued subject to the following limitations:a) No nonconforming use shall be extended, expanded, enlarged, or moved to occupy a different or greater area of land, buildings or structures than was occupied by such use at the time it became nonconforming; provided, however, a nonconforming use may be extended throughout any parts of a building which were specifically designed and arranged for such use at the time it became nonconforming.b) No building or structure devoted to a nonconforming use shall be enlarged, extended, recon­structed, moved, or structurally altered unless such building or structure is thereafter devoted to a conforming use; provided, however, such building or structure may be enlarged or extended upon prior authorization from the Board of Adjustment, which authorization shall not be granted unless the Board of Adjustment makes each of the following findings of fact:1) The proposed enlargement or extension shall be de minimis in relation to the existing building or structure.2) The proposed enlargement or extension shall not increase the intensity of the nonconforming use, which is to say, it will not result in an increase in dwelling units for a residential use nor in gross floor area for a nonresidential use.3) The proposed enlargement or extension is designed so that it will not render the use of the property any less compatible than it is in its existing circumstances.4) The authorization of such proposed enlargement or extension is not otherwise contrary to the public health, safety or welfare.c) A nonconforming use of a structure may not be changed to another nonconforming use unless such change is authorized by the Board of Adjustment.

I will say we get an inordinate amount of scam requests and if we had instant booking on, we would have problems.

This is a scam, @Jack Gowan.

Such people make it easier to trust because they’re unlikely to be a complete scam.

I have read some horror stories of this (Google SDIRA scams, there are many). 

That lowball offer was from, I'm guessing, a wholesaler, and the agent wanted to assure me that it was a "scam."

I received a $69.93 check a few weeks ago (fyi I invested 5k into Nuurez back in January 2021) in the mail, which was interesting considering in October we received an email asking for our bank information so they could deposit the dividends into our account directly … I don’t want to believe this investment is a total scam just yet, I think it’s going to require patience, however their communication is absolutely bogus and unfortunate.