You'll end up with a dog that you can't unload at the end of the day when you've dumped thousands of dollars into it with no positive return. 

The number of calls you make, are only important if you are guaranteed a specific dollar in return per call. 

Of course, with private lenders, you must give up equity or a return on the debt.I agree with @Jonathan Greene that the BRRRR market is difficult right now.

I'd like to not "find out the hard way" if one of these sites are not a good match for me.The ones I'm considering are Propstream, Property Radar, ListSource, and PropwireSomething to note, I am looking to return to doing some wholesale deals, using criteria such as absentee owner, out of state owner, tax delinquent, vacant, liens, and pre-foreclosure..

I've had low returns but in general all have made money.

Not what we are looking to do and all the MLS listings just don't pan out numbers wise so far.That's awesome that you got some returns on flips and found some buy & holds recently. 

I have heard positive things - expect lower overall returns in exchange for them doing the work! 

But returns take out risk.  

If you have a regarded tax entity, e.g. partnership, S Corp, C Corp, you need complete financials -- P&L and balance sheet to adequately prepare the tax returns and answer tax related questions. 

he has the 3 missing packages and states they were delivered to the wrong address and that he is returning them.