Also I do not believe in Appreciation which is just icing on the cake. 

However, I see the potential capital gains as the icing on the cake.

Every property in my portfolio was originally under 50k and getting loans for them was cake.

For the most part we can still find deals that cashflow but personally I’m a bit skeptical of appreciation. so While you did great in Cambridge my advice would be to buy for cashflow and then any appreciation will be icing on the cake. 

With this being said, there are a lot of bad deals out there right now, so double check pro-formas, do proper due diligence, and the next investment will be a cake walk.

Also, assuming it does exist, why would a turnkey provider offer this service when they can have the whole cake and eat it too while selling traditional turnkeys?

You can't have your cake and eat it too...

You can't have your cake and eat it too.

For a house hacker that qualifies for this it would be an enormous stretch, for an institutional investor thats looking to park money there's no cake on top at the current price (appreciation) and there's no cash flow.

If they are really caking it on maybe consider negotiating with them or finding someone who prices better.