Absolutely. You have an obligation to yourself to maintain or grow your skill set. Or, you can let your skills stagnate and atrophy and hope that the job your in stays exactly the same until you retire. Good luck.
"The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood"
- Theodore Roosevelt
Author of:
SQL Server Execution Plans
SQL Server Query Performance Tuning