Red flag!?

[Joe Gemma]

in a dilemma and in need of some BP community feedback. 

I'm searching for my first investment property and found a duplex that I'm very very interested in listed the low 100k's. I put in an offer 20k below listing to feel out the sellers motivation with contingencies based on an inspection. I received a counter offer today as expected but there was a big caveat. 

In the counter, the buyer demands use of MAR As-Is Addendum option (A). This in essence states that if accepted, the property is sold as is and that an inspection cannot be a condition of the sale. 

This was a huge red flag to me because this isn't a rehab in a war zone that you might expect to see an addendum as such. To me, it feels like the seller has something to hide but I have very little (basically none) experience in real estate so I'm relying on intuition. At the same time, I don't want to pass up on what may be a great investment. BP, what are your thoughts?

Joe