It's ancient (my 80-year old parents spent the first night of their honeymoon there!) 

Using the most common accounting methodology, all flip costs are considered COGS (cost of goods sold) and are carried forward as inventory on the balance sheet (work in progress) from one year to the next until the property is sold.That said, if you're working out of a business entity, you may have to track inventory on your tax worksheets.

Following his prescribed methodology I purchased my first investment property within 90 days and have turned many people onto it since.  

Do you think that during ancient times of virgin sacrifices that people were so polite you couldn’t imagine?

It's actually ANCIENT technology where an image, "shot over black" (no background) and projected on a nearly transparent screen appears to be floating in space in 3-d.

I guess I can't say I gave you a methodology to tackle this question.

My methodology with the postcards is to use them as a first contact upon which they can call me, email me, or check out my website.

Ancient Chinese secret.

What I didn't see in the presentation was a methodology or basis for an algorithm that could identify vacancies.

Even if the methodology they teach can be successful (which is in doubt), it certainly cannot be successful at all times in all markets.