The broker didn't ask for anything out of the ordinary/suspicious, except to tell me that I would need to pay for the appraisal when it occurs (rather than at closing) bc it's done by a third party.

Profits you make when you sell will ultimately be taxed at your then current ordinary income rate when you start taking distributions.

If so, what specific contingencies would be considered 'common' vs out of the ordinary or unreasonable?

If you intended to sell it as a spec house, it doesn't matter if you sold if after 5 months or 5 years -- it's dealer inventory and subject to ordinary income taxes.

While not impossible or relatively uncommon it is not all that common due to the nature of the security instrument and the ordinary course of business most Mortgagee and Servicers conduct in the state.  

I hear what you are saying and we can agree this stands to be more extraordinary rather than ordinary.

As to fees "if not paid by the bank" the bank are used to paying ordinary closing, title and settlement fees.

I believe the NV BK trustee generated the addendum, and put it on the an NV realtor form because that's what he had available, which is not out of the ordinary.

An ordinary person, of ordinary means and knowledgeable of the concept would not agree to such a thing.

That's at your ordinary tax rate, but is currently capped at 25%.Even further, as you rent you may end up with passive losses.