As a hosting reseller, you may want to offer your customers an option to buy domain names from you. As a reseller you wil usually get the domain names at around $5-6 each and will be able to resell them for anything as high as $35 per domain. And remember, domains are paid for annually, so a year later, the customer may be paying you again…
Domain registering can be a tricky business. If your customer is sending you the desired domain name by email and wants you to register it for them, you will be responsible for getting the exact domain name requested. If you make a typo, you end up with a useless domain name that you will have to pay for.
However, many hosting companies that offer domain registration services, also offer their resellers an option to resell domain names for them at a certain profit. The profit may be lower, but as a reseller you simply have to copy and paste some code into your site, where your customers can search for the domain names and carry out the registration for themselves. You, as the domain reseller, are out of the loop. Less of a profit maybe, but less of a headache as well.