I've written a relatively long blog post about some of the lowest performing altcoins on Bittylicious, a UK coin sales platform (somewhere between an exchange and a p2p trading platform). This is at
https://blog.bittylicious.com/2015/03/coins-at-risk-vertcoin-quark-peercoin-and-worldcoin/In essence, there are some altcoins on Bittylicious that have sales of less than £100 per month, and it's not really worth keeping them running.
The coins at risk of removal are Vertcoin, Quark, Peercoin and Worldcoin. One of the Worldcoin team have engaged with us and they're trying to increase uptake, which is the right approach.
So, really, I'm just throwing this information out there, hoping that there can be more engagement between the altcoin community and exchanges like Bittylicious. We certainly don't have time to market altcoins ourselves, but want to see whether there is a future for these coins.