+1
Transparency is really important here.
- Publish the BTC and XCP collected somewhere !!
I agree.
- 2.5% is waaaay too much (I seem to be alone here) 100BTC daily trade won't last and soon if another exchange adds XCP, you're dead in the water.
I think it is fine, today's volume shows it is not an issue. I don't think any exchange will take XCP soon, as it is much different then adding a bitcoin-based altcoin, so I think it's OK to charge a premium for the time being.
The faster the payback of lost coins, the better! (But I am biased, I lost BTC!)