Quote: "
Though there is one question about the price thugh. Torque costs €100 and DGDK costs €60
"
Actually Torque (and Cipher) cost 100 USD, which is € 85.
DGSDK costs €45 + VAT (which in my case came to about €53) - but you can only make freeware games with that version: the price to get a licence akin to the other two engines is €150 + VAT (i.e. about €180) for Dark Game!
So, I really think there would be no need for a price hike either. If TGC really _really_ want, they could make the source available to the 150 euros crowd (not a great idea if you ask me) but maintaining the price would not be unthinkable.