From this discussion, I am seeing very few downsides of this product other than obviously having to wait to retrofit your plumbing system until it actually needs the work.

When we sell houses we look at where we fit in the market with the product we have completed. 

@Martin Peter Looks good, can't wait to see the finished product!

If you read every label of everything you purchase, you are a meloncholy.

how much is the product per month does any one knows this question

Your product sells itself!

To met that looks like an isolated incident, not the product of a bad neighborhood. 

I'm going to use a bit of analogy here...For a real estate investor, a spreadsheet or calculator is a tool...Just like a skill saw is a tool for a carpenter...As a carpenter apprentice, you should learn the necessary 'skill sets' and 'crafts' to safely and responsibly use your carpentry tools to provide a professionally finished product for your clients.As a new real estate investor, one of your main 'skills sets' or 'crafts' that you should develop is the ability to analyze the financials of potential deals. 

. : )Having said that I always find it funny that some investors label brokers/agents as UNINFORMED or NO GOOD if they do not want to try some no money down or wholesaling type arrangements.

My main area of expertise is Oil & Gas exploration/production, however, I have two partners that have convinced me to join in on a commercial development project.