I would gladly pay 80 bucks for a disc if I could make it fly 400ft..
I don't know how much your time is worth but you should probably spend a little more of it on practice instead of new discs. I know Innova is making it easier for everyone to hit the 350-400 mark with less power and less practice but it feels a whole lot better when you earn it yourself. And that costs time. Nothing but your own time and effort.