Umm..I think you have the exchange rate slightly muddled..Gigas works on the 1k bs for 2mil gigas. So, if 1bs is 2500gp, then surely 1kbs is 250,000gp. So, 250,000gp is equal to 2mil gigas, and if you are following that exchange rate, it will be 125,000gp for 1mil gigas, 1/8 of the price you suggested