Hello,
Well, your questions seem that you wish to be the reseller, better you have posted this into reseller section, anyway, being the reseller is really a very good startup for your business, but it is also important that you must have proper planning for it. If you wish to be a reseller for shared or for VPS then proper partition must be done using virtulization. It is not just you purchase the server and you sell it with high price, this condition can be digested only if you wish to sell unmanaged server. Further just purchasing and selling server is not at all a business you need to be Tech savio for this too.
Thanks
Calvin K