The price is rocketing because:
1. Marketplace
2. Advertising platform
3. Online wallet
4. Active developers
5. Most stable fast crypto
6. Active community(see thread)
7. Fair launch
8. Well thought out parameters
9. Optimizations to client
Fixed that for you. It is shocking to me that the marketplace is listed as the first thing on your list. There are a few big issues with the marketplace, probably stemming from the fact that it was so rushed to be released.
It lacks SSL which is really surprising to me considering the main target for the website is people whose computers solve cryptographic functions 24/7. Don't be surprised when you password gets cracked. Hell, any website that involves moving money should have SSL.
I guess the other main issue is the products. Earlier today I saw someone selling a unicorn on there. There is also a house going for a price that is greater than all DGC in production, with a picture that looks like it was taken off of google images.
Once you fix it up, and you don't use a crappy template, the marketplace might be a great place for the exchange of products for DGC.
I respect your other work, I just don't think features like an unfinished marketplace are good for the coin.