There isnt a limit on the amount of fan pages you can have, there IS a limit on the amount of personal profiles you can have...you can only have 1 personal profile page on facebook, you can have unlimited about of fan pages.
The other issue is using fan pages appropriately. Here's a good article on that subject http://sportsgeekhq.com/social-media/how-to-get-your-facebook-banned/
By the way I have multiple fan pages and I'm the admin for 6 or 7 other fan pages. Been doing it for years and I have NEVER used proxies.
Jerome
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