Not unless you are a sponsor. EliteTrader is free for users, but does cost money to operate. Baron gets that money from folks who pay for the advertising on this web site. It works great, users get to use it for free, advertisers support the site with a tiny percentage of the business they get here.
Now imagine if you were one of the sponsors who support this site and keep it free for users. Part of your profits go to EliteTrader. Then comes somebody who advertises their service, but they don't pay anything for it. Not very fair, eh?
The reason EliteTrader is free for users is because this is an advertiser supported medium, just like radio, television, newspapers, etc. It would be very unfair to let some people advertise their service at no cost, but require others to support EliteTrader to advertise theirs.
You'd have to talk to Baron, but I bet he'd cut you a pretty good deal for advertising.