SplashNetHosting

Hi Guys, Just wondering if someone can help me. Currently starting my own Web hosting company, ive worked for one pretty much for about 4 years, I have alot of money to invest in a company which why I started. Been looking all over the interenet for a simple answer to my question which is: Do you have to sell domains to allow customers to transfer domains to you, I have been told I have to? I dont want to sell domains, just allow customers to transfer them to me.