This one's a bit hit and miss but if you can get in it's well worth it. Vanson Bourne offer £5-10 per survey (usually in Amazon vouchers), however you need to be in IT or a business professional. I know that sounds a bit vague, but they are a little bit vague about it themselves. But if you complete the fairly short application form, they say they will get back to you and let you know.

I've no idea exactly what job titles are included but I work as a Business Analyst and they accepted me. However, I have friends in various professions who have been declined or just never heard back.

If you are lucky enough to be accepted, surveys seems to come in fits and starts. You might get none one month and then five the next. Surveys are from quite a range of topics so I don't know why they only accept business people.

If you're unsure whether you fit their criteria, may as well apply anyway and see.