Which 5% on that is nearly nothing.I figure that for one to make some money you need massive scale purchasing certificates.Some napkin math: if I aim to make $3k this cycle I need need to buy about 100 of the $600 certificates, which means I need to bid on at least 3000 certificates.Is this what people do to make money on tax liens?

Back of napkin, I worry that you won't have much left over after expenses.

The following items are covered under building coverage as long as they are connected to a power source and/or installed in their functioning location:Sump pumpsWell water tanks and pumps, cisterns and the water in themOil tanks and the oil in them, natural gas tanks and the gas in themPumps and/or tanks used in conjunction with solar energyFurnaces, hot water heaters, air conditioners and heat pumpsElectrical junction and circuit breaker boxes and required utility connectionsFoundation elementsStairways, staircases, elevators and dumbwaitersUnpainted dry wall and ceilings, including fiberglass insulationCleanupThe following items are covered under contents coverage:Clothes washers and dryersFood freezers and the food in themFlood insurance does not cover basement improvements or items not necessary to make the home safe, sanitary and functional -- such as carpeting, finished walls, paint, floors, ceilings, furniture or personal belongings that may be kept in the basement.

There is wording in the deed that states the sewer line and Gutters and Downspouts can't be obstructed and I am fine with that but there is also wording that says "Any and all repairs made upon said storm and sanitary system shall be born equally by the parties using the same".

It’s simple back of the napkin math to see how beneficial it it’s to leverage vs paying cash for something.

The 70% guideline is ONLY a back of the napkin calculation and not to be used as a purchase decision.

Just do napkin math and figure out what your max payment can be and then you can tell your loan officer what that max payment should be and they will do the math on the max loan amount. 

Scribble it on a napkin if you need to.

Based on a back of the napkin calculation of the possible selling price and monthly costs, etc, the property would cash-flow.  

Considering all of this, if I was going back of the napkin math, I would assume you are in between $100k and 125k.