Amazon have a large ammount of buying and negotiating power. I wouldn't be surprised if amazon had a bigger profit margin than tgc.
I don't see what tgc can do, they need to sell dbpro amazon don't. Tgc don't have a lot of leverage to reduce costs from the supplier.
This is all based on tgc having to buy through the uk publiser, if I was publishing dbpro in the uk I would make tgc buy through me so I had control of pricing and sales figures and so I wasn't wasteing marketing money boosting someone elses sales.
p166mmx @ 233 : 256mb : sb 128pci : sis onboard