In summary, ZebPay states that their prices are high because:
There is no single international price. Prices vary significantly between exchanges in different countries. (so you are basically saying you can charge whatever you want since there is no "fixed" price).
Our prices are not higher because we are fleecing our users. We keep increasing the sell price till we have sellers. And we keep the buy prices very high to discourage buyers. If we dont do this, we will have no stock left to sell. (no comment)
The other thing you will notice is that difference between our buy and sell prices increases when prices are volatile. We have to do this as explained above to manage buy and sell demand. When prices are relatively stable, we can manage our stocks better and we reduce the spread.ZebPay is NOT an exchange, though it may look like one.