In the US there are about 40 Official Registrars appointed by the corporation that controls the Internet affairs.
The Internet Corporation for Assigned Names and Numbers.
When you buy a Top Level Domain (TLD) name from the reseller, make sure that you know who is the actual registrar (e.g. Netsol, enom etc.).
Your Domain name is actually with the official registrar, if one of them will go down it will ICAN job to find a solution.
ICANN-Accredited Registrars
The official Registrars tend to be more Expensive (E.g. Network Solutions $35 a year).
Resellers provide most of the discounts. They buy on our behalf large amount of Domains and thus get better price. However, they are not in control of the system
If you buy a TLD from a reseller, and the reseller goes down you can have a variety of troubles since you are not privy to nature of the deal between your particular reseller and the official registrar.
If you buy or rent one of the ?tricky? lower level domains, you probably will loose it if the reseller ?disappears.?
Here you have an example explaining the Domain Level using TLD.gov
Domain Levels Explained.
If you care about your creation do not base your decision on few $$$ a year.
When you buy a domain from a reseller, wait few weeks, and enter the domain name into WhoIs engine to make sure that the domain is registered with an official registrar under your name, and did not stay in the hand of the reseller.
WhoIs engine
E.g., I bought my domains from a reseller but WhoIs search shows that my domains are registered with enom.com, which is an official Registrar. That means that the domains are officially mine.
So YMMV be careful every one.