I figure the listing agents wouldnt be too enthusiastic about receiving a wholesale offer considering it directly impacts their commission.  

Deductions all work the same way and you're absolutely correct to assume that your tax deductibility practices impact your qualification eligibility. 

Trees, flood plains, and other due diligence items can impact costs and the size we can build, but we'll get to those later. 

Otherwise, you have to keep it for the length of the loan, regardless of loan to value.I financed my 4 unit building at 3.5% down for 15 years (to minimize impact of MIP for length of loan).

Doing those thing cost time, money, good tenants, future goodwill (which is always needed sometime) and impact the investment more than can be calculated.The next issue between properties may be something were you need your neighbor's help to fully address. 

Tell them you would prefer not to have to evict them as it will impact their criminal and credit history for years to come.

The speed of repayment will not impact your score.

I just will not trust my tenant with an item that will impact my title.

The laws matter, a lot,  and no matter how good you are they impact your bottom line.  

I wouldn't discount the impact that technology will have on your business dealings.