Vegas there are many alternatives which you could try. If you wish to build money as a direct resellers then reselling VPS is always a good option. With this you could also resell dedicated servers. Doing this means there is really no cost to you as your customer pay the price you set and this price tends to be higher then the seller price you are given from the hosting company your choose.
These are great alternatives to lets say, buying a dedicated out right. When you buy the server yourself of course you could make more profit, but you also run the risk that if you do not fill the node by the next due date, then you are hurting all those customer who will lose their service.
You want to make sure that if you are going to buy servers instead that you have the funds necessary to fund the server if your first couple months do not go as planned. I'd say that if you are looking into reselling that you find the best bargain with the best service and not necessarily the cheapest price. There are many hosts who provide both and are willing to even help you gain new customers
. Good luck!