Do any necesssry repairs and that’s really it.The electric bill will fluctuate up and down depending on the season.

It's a challenging question to answer for agents because it fluctuates significantly from month to month and even year to year.

You are not so much concerned about how the pricing of homes fluctuates.  

If your strategy is buy and hold and your numbers work you may not have to worry about short term market fluctuations.  

When evaluating vacant lots in New Jersey how do you know if the lot is a good deal when the prices seem to fluctuate so much for similar properties?

Next easiest is a stable/normal market,  since estimating is easier (not much fluctuation) and "errors" can be covered by time.

My advice is continue to watch home values fluctuate and jump when prices drop.

My gut reaction from an optics standpoint is that if it were me, I'd rather pay them separately.If that tenant's duties change (whether increase or decrease) it would seem a hassle to fluctuate your rent accordingly.

What I mean by that is in larger cities there are many and varying markets, thus providing different opportunities, especially as the economy turns/fluctuates.

Some of the most common risks involved in a “buy/fix/sell” strategy are fluctuations in supply/demand of housing in the neighborhood, incorrect estimation of repair costs, project going over scheduled timeline, and general contractors walking off the job or stealing your money.