Hi Jagui, you are right if you are talking about Zulutrade, becuase it charges an extra commission from 1 to more than 2 pips per trade depending on the broker you chose for trading with them. I am trading now with Rentasignal and they are not charging any single pip because they are compesated directly through the spread, and their spread is the same you can get with FXCM. However they are going to charge something in addition soon, at least they are telling that.
What you can do if you are using a service that charges pips based on volumen for testing signal providers, it is trading with micro lots till you are sure that this signal is what you are looking for. Then, you can trade with your usual sizes.
I will try also Tradency, they seems to work like Rentasignal, but I am not sure about what they charges to you.
I like to trade with these websites, because I only have time for selecting and adjusting the signals to my size account. I would like to have the possibilitly for trading manually, actually I did it for several years, Futures and then Forex, but I don't have time now.