In light of the following post, it would probably be best not to sell bitcoins to WhatsBitcoin:
Every casino or sportsbook owner. Ban any accounts you have related to me. If I've done business with you enough, trust me you will have heard from me at some point or another. Many owners know who I am. I will reach out individually and contact each of you directly at some point but not right now. I have a lot of work to do to get better.
Nitrogen did not cancel my bet but they did talk with me and helped take me from not being suicidal anymore. They helped me ban myself from the methods I used to get bitcoin quickly, aka coinbase instant.
They also offered me a solution that was fair and I want to thank them for reaching out to help me.
It appears that he would prefer that people NOT sell him bitcoins.