I started setting up my portfolio on Quickbooks and now I see a fee for rental payments which seems unnecessary since there is already a monthly fee for having Quickbooks in the first place??

So, IMO, unless you are a good politician and have money for unnecessary repairs at the Corps whim, I wouldn't suggest you go into that business.What is a great business, is the boat dock repair business and building new docks.

Totally unnecessary. 

In this case it is a property I have had for several years (new carrier this year); seems a bit unnecessary for a property that has been there for many decades without needing them. 

I'll do this because there are (usually) financial incentives for unethical behavior by property management company employees to create churn (and additional placement fees) by failing to work with tenants having temporary problems and by failing to promptly take care of maintenance issues they cause unnecessary turnover, by nickel-and-diming tenants for late, lost-key fees, etc., and "damages" to increase their own performance incentives, by charging top-dollar for mediocre workmanship and pocketing the difference, and by steering tenants to their own or their most profitable apartments.

While a separate checking/savings/dba acct may make things easier to track, an LLC is unnecessary at this point.   

Because its time to not renew it....You can be in the camp of " as long as they pay and include the late fees etc, I dont care, it make me more $$" camp......or the " all these late issues, adds unnecessary stress to my life, and I'm done dealing with it" camp... up to you. 

Dropping rates to zero at the outset of COVID was foolish and unnecessary.

The seller is soon to be out of the relationship... they shouldn't include any unnecessary terms.

And sorry that realtors have given you the impression they are unnecessary.