Pros & Cons with cash only MLS Vs. Assignments

Alright guys, 

I have been wholesaling (doing double closings or assignments of contract) for the past several years and wanted to get the all-stars (aka YOU) thoughts on buying these homes with short term capital (i.e. private capital, hard money etc.) and putting these investment properties on MLS for cash only purchases to get a larger buyer pool on our properties (thus creating larger margins). 

My thoughts here is that, even though I have a very large cash buyer list already, I will be able to make larger spreads by putting the wholesaling deals I find on MLS due to a much larger buyer pool (even though I still have to pay 3% to BAC). I will be listing these homes myself due to me being a realtor. 

What are the thoughts behind going this route (mls/cash only) vs just doing an assignment or double close? Do you feel the margins will be larger going this route? Do you feel it's more risky/less risky? 

What are the key components to keep in mind if I were to go this route (other than knowing I have a solid deal).