They have to impress you with what they offer, not the other way around.  

I'd also be interested in any aggregated source of data, if there is someone who collects data for multiple jurisdictions.Thanks in advance!

Some bidders will go after HOA liens in any position just to collect rents until a senior lien forecloses; they never expect to get clear title 

There are federal and state programs for foreclosure prevention that are free of charge The hamp program has helped thousands of homeowners Short sales,deed in lieu  etc are some of the ways.The best way is to contact your lender for options Many companies have been convicted of crimes for collecting false fees in foreclosure fraudHere is a great web site without any charges http://www.homeloanlearningcenter.com/yourfinances/foreclosurepreventionresourcecenter.htm

Also, if you get a monthly spread after the mortgage is paid, how do you collect it as well?

So basically do you think if my pocket cash after I collect rents from my first building is good.

They don't care what "theoretical rents" are, but rather what is actually collected.

Collecting money from a deadbeat who skips town has a very low success rate. 

As other have identified, you won't be able to collect for any damages as I rented to a Canadian citizen who was a great tenant for three years till he did not pay for three months and quietly vacated the property.

., as noted, if you want everything to be above board: collect a W-9 from everyone you hire.