Now, as long as I check in occasionally to make sure expenses are going in the right category, I can easily total up certain types of expenses.

I guess it can happen but as real estate goes I think this is by far the hardest thing to put together sustain and be profitable at.. other than a side hustle make some money occasionally if you darn lucky type thing.. folks I know that do this successfully spend probably 100 to 200k Minimum a year in mailers ALONE  and they have teams that door knock that get paid and Very robust back end systems.. etc etc.. this is a capital intensive business to do right.. 

Car prowls happen fairly regularly as reported by people on nextdoor.com, often when stuff left visible, and there are occasional burglaries.   

We have our attorneys foreclose in these cases (with an occasional DIL).

I can tell stories of what so called wholesalers did to people that totally fubared them.. ( the owners) I still occasionally see con artist people still doing this rent-back scams with people in pre-foreclosure.

I will try occasionally but end up putting it on MLS and offering the selling broker their fee.. 

Those fees seem rather extravagant.

There will be small dents created occasionally, as simple wear and tear.

I get auto listings from a few different agents and I usually already know 90% of the house they send me but occasionally a new one slips in I haven't seen yet.

They are only more efficient if you use less than 40 gallons per day...ahaha.Standard tank heaters have an expected life span of 10-15 years, but they will usually last up to 30 years with even occasional maintenance.