Chadster- there is no blanket answer to this question, as it’s like asking how much people make on flips. It depends a lot on the individual and the deal.
I wouldn’t worry about what the wholesaler is making as much as what price you are paying. Does the deal make sense at that price?
In your case, I would ask for a copy of the contract you will be entering into before making an offer. The structure of the deal will affect what services you need from a title agency. You need to know who you are actually buying the property from, and any other fees in the deal.
I see lots of people try wholesaling and not make anything. I know a few people who do wholesaling who are really good at bird dogging, and definitely earn their fee. If they bring me a good deal, I don’t care what their fee is.