Well Gontzgv, FoD has to pay the bills somehow. I'm a non-subscriber at this point as I don't have the time to make it worthwhile to do so. I do understand that subscribers (thanks folks!) make it possible for me to enjoy the occasional free game. I certainly can't begrudge them additional privileges.
Like any business, FoD has a model and I assume they make their money out of a combination advertising and subscription fees. It's great that they offer a free level and I think it's a tad unreasonable to label pay services as unfair.