Some of those sources have a brazen history of fabrication, feckless interpretation  or erratic conspiracy theories.

I would question whether or not that number was fabricated.

If they will make up stuff like that then what else will they fabricate??

Here are a few shots of the Juliet balcony and the basement handrail I fabricated, painted and installed.

In most of the flower beds I have put down landscaping fabric and 3/4"- 1" washed river stone.

I saved around $1400 cutting the stair stringers myself over getting them fabricated. 

You can judge & critique the price of the property all day by what the seller asking price is, but real deals are made all day by consistently making offers and through delicate negotiations.

It can be as crude as a trench filled with gravel or include piping and geotextile fabric.- When the drain system cannot be terminated to daylight, then the system is often terminated in a sump crock/pit in which a sump pump is added.

I mean, what does it matter if my legs are covered up with a sheer nylon fabric or not?

If you're only going to use the AquaDefense on the joints, make sure you have the fabric that goes with it (the video series I linked you to above will show you how to use the fabric).