Hi! We started an altcoin exchange (
https://coinfresh.com) and we are evaluating which coin to add. There are so many coins out there now days it's hard to tell whats good to add. What do you guys think is a good metric to use?
What you need is trust of the altcoin investors. In the past some alt exchanges popped out from the bottom just for stealing money from people who deposited money there.
Find a way people trust you!
This will also help you to add the good and promising coins.