That's correct. The 1000 BEE is a base amount for premium access, and then it's 200 additional BEE staked per trading pair after that. Staking represents your entitlement to use a certain amount of system processing power. As you add more markets, the amount of processing power you are utilizing increases, and thus so do the staking requirements.

Note however that if you don't have enough stake to run the market maker on several markets simultaneously, you can simply delete an existing market configuration, then add new configuration for a different market. So you can experiment with moving from market to market and see which one works best for you.