ruseneca: you need to research OTM, ATM and ITM options. What you state is just not true.What type of signals do they provide - for forex trading on margin account or for binary options trading?!
In case you are trading on margin, you should risk no more than 1-2% from your balance per trade. Still, a win ration of 70% and above is very good for both types of trading instruments but it depends on the risk management.
This bogus strategy is for Nadex binary options. I have an OTM strategy that is quite profitable with a 21% win rate and an ATM Strategy that also does well at a 53% win rate. For an ITM Strategy you need 90%+ to be profitable (which is what this seller claimed).