Installation, updates, manuals and APIs.
Code, issues, development roadmap.
Custom job offers.
Send us your sales or general questions.
Shared/dedicated, it wont matter soon.
Dolphins multi-clustered capibilitys means you could run Dolphin from any amount of servers (dedicated or shared) and optimize performance evenly.
I would rather have a bunch of shared servers, all hosting my Dolphin powered site to increase reliability/speed/.