On one hand you if you feel comfortable you would be able to collect the broker compensation on each deal minus your expenses.

I will compensate you for your time.

There are also 'loan guarantors' (or 'key principals' KPs) who get compensated for signing on the (non-recourse) loan and bringing their net worth to qualify for the financing (i.e. they get a share of the general partnership).

I was never one to compete by cutting commissions.....but right or wrong, you agreed to a total $2,000 compensation, and the BTSA is a commission.  

I could compensate my agent to show the property.

He may have been talking about savings on self-employment taxes, although I'd question how he's coming to 'reasonable compensation', which he'd have to use in his calculation of tax savings. 

No, with truly self-directed Solo 401k plan you can contribute first $18,500 (plus $6,000 catch up if you are over 50 years of age) up to 100% of your self-employment compensation, then on top of that you can do additional 20% of your net SE income (25% if you are incorporated) for combined maximum of $55,000 ($61,000 for those over 50).

I also only sign up a PM if their compensation is aligned with the financial performance of the property (e.g. % of rent collected vs monthly flat fee). 

It is incredibly common for properties in your area to go for over asking2. you are confident it will still appraiseor3. you are comfortable with and ready to compensate the difference between the appraised value and your offered amount in your down paymentI don't think hoping the appraisal will come in low so you can negotiate down after the fact is a solid strategy or a strong starting position.

I do lot of things for no compensation.