This step is extremely important as it will save you a lot of time, money and a migraine. Searching the USPTO database for registered trademarks is not enough. There is something called a common law trademark that the USPTO does not track. Although, these types of trademarks are not registered, their use in commerce affords them trademark protection and the owners could challenge the registration of your mark.
Imagine falling in love with a name for your brand and spending time and money building your bran around that name. You decide you want to trademark your brand, so you proceed to file an application with the USPTO. Approximately three months later, you receive a communication from the USPTO examiner and you’re super excited to see what the next steps are… only to find out that it is an office action rejecting your mark for likelihood of confusion.
Or, in the alternative, your mark gets registered! You’re happy because now you’re good to go! But… someone with a common law trademark gets a whiff of this, and now there are petitioning to the USPTO to cancel your registration because they have a priority claim.
How stressful would it be to invest your time, money and energy into a mark that you absolutely love only to have it potentially snatched away from you? A comprehensive clearance search can at least lessen the blow in case a change in your mark is necessary. Your feelings might be hurt temporarily, but you will save time, money and energy because you would have prior notice of potential problems.