I don't find a point in reseller hosting!!!!!! :---
I don't think it is necessary to purchase reseller hosting package because it's a waste of money for what many reseller hosting service providers provide :) You can just purchase a small vps with more flexibility and provide your clients a more personalized experience by customizing the control panel that you install on it. Also, if a contradicting my opinion by saying I can get a free billing system!! Well if you a are serious about starting a web hosting business you wouldn't mind investing a little under $500 for the vps hosting for the many shared hosting service and the billing system!!!!!!!