Not sure if it was in the top 10 but I believe LottoShares dropped from a multi-million dollar market cap to a couple thousand when the dev abandoned the project.
The only reason why Marinecoin was able to reach a multi-million dollar market cap was because the coin supply was massively premined to the point where almost all of it was under the dev's control and any small investment could skyrocket the market cap. Solarcoin - with its 99.4% premine, had the same thing going on too:
http://coinmarketcap.com/currencies/solarcoin/BitShares-PTS lost value because holders of PTS were rewarded with BTS and shares in various DACs. Once these snapshots have been taken and the sharedrop is over, the PTS naturally lose some of their value.
I am not happy to see master coin on the list
![Embarrassed](https://bitcointalk.org/Smileys/default/embarrassed.gif)
Mastercoin was overtaken by Counterparty but it's still in the top 20. The market caps of both coins are now closer than ever before since XCP has been declining steadily since the November pump ($20 million to $3.3 million) while MSC has kept most of its value ($1.7 million to $1.3 million) during the same time.
thanks yeh lottoshares was as high as 7th, so i add it, dead now