With version 7, provided (and this is very important) that you do not have any other bots running or the BetFair web site open, you can monitor as many markets as your computer's resources and Internet connection will allow. This however does not mean there is no limit to the actual number of markets monitored: MarketFeeder Pro will cut down on the requests to BetFair automatically, to keep you within the free 20 requests per second. This in effect means you can try to monitor 200 markets at the same time, but the actual refresh rate will be very low.