@Nereo Mendoza has a good point.
You should understand what your buyers are looking for and how it is that they are going to make a profit. I'm not one to go with 70%, 60% or 50% of ARV minus repairs. In smaller markets, you could be put in a tight situation. Take for example a house that has a $50K ARV, at 70% you're looking at $15k budgeted for transactional costs.
Let's break it down for your buyer:
Wholesale Fee: __________?
Buying costs with title company (1-4%): $500-$2,000
Money Costs (say 3-5 points, plus 10% interest over 3-6 months for a $50k loan): $2,500 plus $1,250-$2,500 in interest.
Holding Costs: $500 (small estimate for electricity, taxes, ins, etc.)
Real Estate Agent selling costs (6%): $3,000
Selling costs with title company (1-4%): $500-$2,000
At this point without including your wholesale fee, we're already looking at a case where your buyer could be in for $12K, leaving him with $3k in profits and of that, he would have had to give some of that (or more than that) to you earlier in the transaction for your wholesale fee.
My suggestion would be to do the math for your buyer's ahead of time before you make your offers to sellers. Understand how much you want to get paid, and understand your buyer's costs and financial criteria.
I'm still trying to get my first deal in the books, but that's my two cents.