Its the restaurant in the club, and it is usually very nice, therefore costing a bit more than €30.
We usually go as one of our 'nice' meals out, and choose it as such for a night we want to go to. For a decent meal with drinks expect to pay arond €50 a head, pretty much what any decent restaurant will cost, though you get free entry, its a no brainer really, and quite a nice expereince as you arent faffing about getting taxi's, having a drink in a bar inbetween the meal and the club etc. etc. 8)