Owner Finance buyer is Investor

[Gad Amit]

Hello, Please help I do need advice.

I own a property in Florida for the last 6 years,

Now I want to sell it with Owner Finance (Zillow say it worth about 130K)

I have nice agent that just got offer. Terms are:  6% Interest rate,  10K down and I think 30 years loan and 3 years lock into the loan with me.

I was thinking it is sound OK but I just found out I have an investor as a buyer. 

A. I am NOT helping some guy that need help…. And 

B. Is it cool? I am missing something. Why investor is doing that?

I'm new into OF, Please let me know what you think?

Thank G