I believe with the low rents Ohio gets, it barely justifies building new apartment buildings in most areas.

The income from from the duplex doesn't justify the value it would sell for.   

The time required is not nearly great enough to justify the 5-10% that these companies want. 

You will find, too often, that insurance agents ignore $10 to $20 a month on our pricing, justifying the higher price quote they give us because they can say it had superior coverages, when the real reason is that their commission with company x is twice that of company y.Last thing: whatever you do, don't fall for the All State bundle.

I cannot justify paying someone to manage properties when my business partner and I can do it ourselves, at least not yet.

I simply get a little scared (not evidence based) when prices have been going up and up over the last decade; although, it does appear to be justified.

If they clean everything good and I understand normal wear and tear doesn't count, so how should I justify to use the deposit to do cleaning before new tenants move in?

I wouldn't charge, but will justify a rent increase with their renewals. 

Fees should be clearly stated, easy to understand, and justifiable.

If I didn't care whether the pay off was 20+ years out, I wouldn't even bother, especially if you're talking about your potential rental and are just going to cash out when there's enough equity to justify the closing.