To be honest I never use these type of sites or TV channels for that matter, my reasoning is if they're making money doing it then someone has to be loosing it and I'd rather it not be me! Bloody hell you say you lost £470! You could have just went out and bought a laptop in a store for that!
I'm not saying you're stupid and I'm smart, that would be insulting and childish and to be honest, I've lost a lot in the past gambling before I realised the only winner is the bookmaker! The saying "if it sounds too good to be true, then it probably is" has worked well for me in the past, and will in the future. It's always seemed to me that trying to save money in this type of venture usually ends up costing more, and it seems you've proven my suspicions correct.
You've been bitten and I'm truly sorry for that, but consider the loss money well spent as you're unlikely to fall into the same trap again.