If you can afford it, by all means put in even more.  It is true that the match will be limited to 5% of your income, but the more you put in, the more that will come out.  At 10% of your income, this would sum up to $1600 from you, $400 from the IRS, and $1000 from DBA.

    After 30 years, your account would have about $675,000.  Even you could be a $millionaire$ -- contributing 15% of your income for 32 years would do it!

Curve assumes an average 4% pay raise.
It does not take inflation into account.