How are people able to offer the things in direct mail post card?

[Yi Lin]

Dear BP family.

I'm thinking about doing direct mail marketing.  I got like a stack of them from other investors and have been studying their messages.  Some are obviously doing a 1031 exchange.  What is interesting is that they all have three things in commons.  They offer seller no fee, no commissions, and no closing cost.  

1.  How are they able to offer these features?  Do they just buy at a such deep discount that they could offer these features?

2.  What is the "fee" that they are referring to?

3.  Even if they are realtors, wouldn't they have to share their commission with the broker?  

4.  How am I suppose to compete on their level when I'm not a realtor?

5.  What is the reasons behind offering these features?

Thank you in advance for your help!