But hands down, as long as you are getting educated FOR FREE I would personally insist you to take as much advantage of that as possible.

Even knowing this, my buyer was insisting on making a financed offer at $420k.

I have no idea whether this is a good idea , but shall I insist on have a copy anyways ?

Most communication is done by phone and electronic files (spreadsheets, QB files, pdfs, etc.)I insisted on a local accountant for years, and while I got what I asked for, it wasn't a good situation for me. 

These are the same idiots that insisted we paint WHITE the old cast iron (slightly rusted) vent pipes on the roof of one of our rental properties.

Do you insist doing the inspection?

Sometimes sellers will ask that a certain company is used, or in the case of REOs then the bank will usually insist that a certain company be used.

It states, When a question is asked in the forums, simply answer it, and do so by providing complete details Furthermore, The real estate industry, like many industries that involve making money, is plagued with those who insist that answers must be paid for

Insisting on an option to purchase will limit your field of rental choices and any money spent on an option would most likely get a much better return for you put into marketing and/or flipping.

If they are still insisting on seasoning, one thing you can do would be to get a good RE attorney.