Also you may have a very hard time collecting on any judgment against the tenant for any rent/damages beyond security dep, so it usually behooves you to get it back on the market quickly.

Collect monthly checks via on-line, tenant deposit rent into a local bank, and etc.u.) rinse and repeatI personally prefer online rent deposits.I most likely miss a step or two, fyi

How will I collect the rent?

Everybody has got to live somewhere and collecting rent checks isn't rocket science. 

Not collecting rents, etc.You must hire a property manager which adds to costs and you cannot do any maintenance yourself so you end up overpaying for work to be done.

You'll look to collect about a 10% dp on these properties (sometimes more) when you sell, so you can very easily recoup your 6k marketing costs in one or two houses just from the up front money you're receiving.

It sounds like you have had quite the collection of experiences in real estate!

cant collect double rent.

Even if you are in a lower income area where no one has good credit you need to see if they any landlord-tenant collections on their credit report. 

Maybe you can hand the deal over to an investor and collect a finders fee if his offer is accepted.