Questions on double closing

[Scott Harper]

What fees are different or applicable when a wholesale deal is happening and a double close is taking place?

Does wholesaler buy a title policy and then end buyer would buy one too? Does wholesaler have to pay doc stamps on the deed and then end buyer would also pay doc stamps on his deed?

Let's just say you had a wholesale deal for 100k and you have found your end buyer who is willing to pay 120k. A double closing happens. Does the wholesaler actually have to have the cash or does the title company just disperse from end buyers money? 

Could someone with experience expound on the procedure for any of us trying to learn? Thanks