I've sent out 2 months of direct mail to absentee owners with parameters such as >50% equity >2bdrms, etc.  

Lets say I find a Single Family 2/1 for between 50-70K in a neighborhood where the comps are 90-120K and rent is going for 1,300/month. 

But, 50/year?

If you are or become an accredited investor, you can buy into institutional grade $50-125M projects with as little as $100,000 and diversify.

In addition to that, banks will only finance against the "lot rent" component of rented mobile homes on land.A $150,000 Park would need about 12 homes with a lot rent of $200 per month assuming a 50% expense ratio and 10% capitalization rate.If none of this makes sense to you I would highly recommend the Mobile Home University Due Diligence Manual.  

For every 1,000 I get 500 back, or a 50 % return of my money.

I'm prepared to invest $50-75k cash to get started, but would be looking to utilize hard money to finance the balance of the deals.  

Rule of thumb apparently being $250/door.

A lot of condos here in Las Vegas run into trouble with financing because the owner occupancy for the community is < 50%, but generally speaking the bank should tell you precisely why.If you don't want to put any cash down, you can research creative financing techniques here on BP, but the more creative the solution, the less appealing it is (generally speaking) and is a tough sell in a hot market. 

If I contributed more money to my 401k would it lower my overall income that is viewed by this rule and therefore I could write more off?