I spend around $200 per month, they deduct it from my account. for radarscreen the feed and the data I don't use them as a brokerage but I have money in the trading account, just sits there. The $200 charting program is WELLLLLL WORTH IT, its the cost of doing business, an extremely low cost compared to the money you can make with radarscreen.
Read this: http://www.elitetrader.com/vb/showthread.php?s=&postid=1180162#post1180162 The audio presentation is no longer available, but interest income is a significant profit centre for TS!