They arrive reliably every month.

If that had been my approach, I would not have arrived in my current financial condition with higher net worth.3.

I don't usually get in my car at all after arriving at the Disney property.

It's just compound interest, same as your credit cards (average daily balance times the monthly periodic rate (or some similar formula - check the terms of your HELOC) plus 1/120th or some similar fraction of the principal balance to arrive at the monthly payment).Also, check your definition of "amortization".

The current landlord for this property is kind and is more willing to pay for replacements on the home which I believe is mainly because she used to live in the home so I didn't really need to spend much for any problems that arrived other than minor things the home is over 150+ years old so it has its quirks.The tough part is that I am paying a bit more in rent for this home but it has a lot more potential than my other unit, it has a good-sized backyard which I'm debating on adding a hot tub or a fire place but seems like a fireplace may be better maintenance and cost wise.

I've generally gone out for those sorts of trips unless you really trust the team to have a sharp eye as a lot of the styling happens once everything arrives and you have to make it fit together. 

Discount depends on model but the discount is about 50% off of retail,  and arrives within a week direct from manufacturer. 

Scott's book to arrive to get to know the mystery?

It would take several years to achieve that rate and you would have lost a ton of cashflow waiting for it to arrive.

The expected payments arrive at the start of every month.