Even if a broker doesn't charge an extra fee for autotrading, you may still end up paying more than if you were using Global AutoTrading. One of the brokers we work with, Tradier, currently offers unlimited equities & non-index options trading for $10 / month (see our promotions page).
In addition to cost, Global AutoTrading can also compete on other grounds:
1. Global AutoTrading often gets fills when other autotrading services don't. Not all newsletters' recommendations are difficult to fill. Newsletters that recommend buying/selling at the market, for example, are easy (although, in that case reacting quickly can help get a better price). But for newsletter recommendations that are difficult to fill (like those dealing with options and combinations at limit prices), using Global AutoTrading can make the difference between following the newsletter and sitting on the sidelines.
2. Global AutoTrading is flexible. We can work with newsletters that other autotrading services don't want to follow.
3. Global AutoTrading accepts international clients (through AutoShares, one of the brokers we work with).