But, why would an investor do this?

Hi Jagan, Many of our investor buyers have been focusing in on TN due to good location and rental demands. 

I originally started off as a OOS investor from CA and chose to invest in the Midwest.

If nobody demands a public auction, the tax sale investor gets the property, free and clear.

I’m looking to build my first spec home but I’m having trouble finding a lender. Most lenders require you to have two new builds of experience. For the last three years I have been a superintendent for a commercial co...

Lawyers are also motivated by making money and I've seen some investors set up ridiculously complex structures. 

A wise investor will not try to get rich quick with shortcuts.

I talk with investors everyday that have purchased land and signed with builders just to find that they still have an empty lot, or worse a started building and the builder is non responsive.  

Also, I like the fact that FTF has funded deals from investors here on BiggerPockets. 

The vast majority of investors don't need it or have a use for it, it's better to use an agent when needed.