If you put those prices in to the game before balancing the specialties, there will be no point in playing anything other than Trader. Cruisers and battleships are the only thing non-Traders can produce in quantities large enough to be effective. With these prices you take that away.

I'm not sure you have actually played the game as a non-Trader. If you cannot capture and hold a number of Jovian planets (and you can't if there's a Trader around who wants them), a non trader will have sub 1000 RO until deep in to the game. At a time when you need stacks of dozens of ships, you'll only be able to make a handful. These costs are the exact opposite of what is needed.