Yes, leaving the designers link is the right thing to do, but it really comes down to how your theme is licensed. If you created yours from the WP platform you may very well be dealing with a situation where you did not have restrictions to use it and therefore cannot in turn impose restrictions on others.
Quote:
If it is how many themes are licensed, no wonder they are in deep conflict with WordPress, which is licensed under GNU General Public License (GPL). GPL gives the receiver of the end product every freedom except imposing restriction on others.
http://scott.yang.id.au/2007/04/on-w...nsored-themes/
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Also see this:
http://www.gnu.org/licenses/gpl-faq.html