Wholesale fee vs RE Agent commission

[Manuel Mata]

After doing some research I am leaning towards getting my real estate license. I do however have some questions concerning commissions. Is 6% the maximum I can charge when selling a house? For example, If I find a seller willing to sell at 40K, but I find a buyer at 50K. Is 6%(3K) all I can make on that particular deal? Can I charge the seller a higher fee?
I understand that I could make more in that particular deal if I would wholesale and then assign the contract. But I am weighing my options before I begin the courses for the RE license.