If you remove market fluctuations then you should remove all the risks too.

This results in $24,500 + Down ($10-20k) = $34,500 - $44,500 for Year 1.Years 2-5 show an increase in profit and net earnings, considering I reinvest.My first thought is: After Year 1, instead of earning profit, I would actually be losing money ($50k investment / $34,500 - $44,500 Net).I understand the market fluctuates, as do decisions involving buyers, sellers, investors, etc so I assume some risk involved.

The low quality rentals can really fluctuate a bunch from 25%-50% for singles (you're buying in the 20-30k range) and 25% for multi.

And when talking to the employer, I always ask if the job has seasonal hour fluctuations and how many hours a week they typically work.

There could be fluctuations in any case.

People may lose jobs and the economy may suffer in general.There are all kinds of fluctuations and variables that will have major affects on doing business.

Insurance carriers have different risk pools and constantly re-evaluate their rating based on those pools, so the rates at any one carrier will naturally fluctuate on any particular type of risk.I think it's a good idea to insure a property for replacement cost, at least at first.  

Although I have a problem using daily stock price as a true measure of volatility, at least daily price fluctuations is something resembling volatility.

If you purchase under the right terms, you should be insulated to a large degree from any reasonable short term fluctuations in the market ... to me, that is the very definition of the "right terms".

You can't easily add to inventory which can lead to mammoth fluctuations in prices.