Currently, I am using another exchange because 2.5% is higher than competetion. If you can customize 1.5% for bitcointalk users (make sharing an special URL for us?) I would certainly use your service for bitcoin.
If they share the link with more than 1 person -- it becomes public.
With that said, I totally agree with you. 2.5% is a bit too much, surely. We don't know how much it costs them to operate and maintain the exchange, but I hope they can drop the fees on
BTC to at least 1.5%.