I would collect a security deposit and first and last months rent as a rule. 

Id love to hear of any successful shared dumpster strategies.  We have a 25 unit complex in a somewhat busy downtown area that we are struggling to keep other (non tenants) from dumping in and around!  We have signage...

And, unless you intend to knock on their door to collect the rent, it's possible to keep your identity a secret from them.

We can help with collections and utility billing automation.

Getting a Collection Guarantee When you’re underwriting a deal and you approach it conservatively, you take into consideration that rent collections may drop in the next 6 to 12 months.

Or they are just collecting leads like spam email marketing then sell the potential leads to wholesale buyers?

If your intent was primarily to resale then you can't.We did an exchange on a hold of 60 days earlier this year - a bear had moved in to the trash area and scared the tenants off. 

A landlord, however, isn’t able to just sit back and do nothing while collecting rent from him for the remaining months of the lease.Generally, the law requires landlords to “mitigate their damages” and make a reasonable effort to re-rent the unit to another qualified tenant.

This doesnt make any sense because I want to collect security deposit before signing the lease haha.

Once they get in the fun begins, that is the rent collection, maintenance and all the other fun activities to property management.