No, they don't they charge what other states charge Maryland residents, and have for years. See the fee table that I included above (where it says "Nonresident non-tidal license fees are equal to the fee charged a MD resident for a similar license by non-resident?s home state.")
Addendum:
This may have changed this spring. The above quoted is from following the links that I buy license from every year (I'm a resident) and is what DNR's buy-it-online site (COMPASS) still says. However, according the latest regulations book (it comes out in the spring) fees are $5/$7.50 for 3/5 day license.