I'd be careful with that. Some survey panels compare the demographic info on specific surveys to your profile info as a quality control check and you can get banned for too man demographic mismatches. For intentional DQs, it's usually pretty easy to figure out what product category they're asking about in the screening part and then say you never use it.

Also, e-Rewards does seem to sometimes do sweeps where they 'catch' surveys you completed but it didn't redirect properly. Occasionally I'll get a 'new survey' e-mail on the weekend where I click on the link and it goes directly to a rate the survey page and credits $2.50-$5.00 shortly after that.