We do yellow postcards.

Aaron,How many postcards are you mailing per month now?

seller called off a large postcard and said They owed 110,000 and if they could get 2,000 cash it's mine.When asked why they were selling they said their daughter was renting the house and stopped paying rent and are tired of dealing with her about it.

I mail a mix of letters and postcards of varying content.

They have super nice postcards, innovative "zip letters" and of course LETTERS.  

Let's remove your email from your yellow letter and also the first postcard that you sent Black and white really needs to have the color items... 

Maybe we can start by finding out what you're doing to find leads, and how many (ie: are you posting out 100 letters or postcards a week and if so, where did you get your list and what criteria are you using for your lists)?

When that sign or your postcards or yellow letters says "We Buy Houses" or "We Pay Cash" and you don't actually buy houses and don't have cash that too is unethical.

As you mentioned you have seen stacks of letters and post cards in places you have bought.  

Postcards bring in about .5%, Zip Letters bring in about 1% and yellow letters bring in around 5-8% on average.