what role domain registrar play for .com and .net extensions. Let say if serversea.com is selling domain in 5$ (not well known registrar) and nexus.net.pk is selling domain in 7$ (enom registrar) then how i will choose quality domain registrar in my budget.
Just like arguably everything else, you do your homework on who you plan to do business with. Without a registrar, you can't register a domain name.