Often when a business or person makes the decision to purchase a Domain, they search for the .com version and register only one
But considering the low cost of domain names, registering only one can be a mistake.
And given the current competitive landscape for Top Level Domain, if there are domain names that sound like they could or should be a part of your brand and you do not own them, someone else just might buy it. It might be intentional or accidental on their part but spending a few extra bucks might mean the protection of your brand. Is it worth it? That is entirely up to you but we think yes