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Steem.DAO pays for doing projects in SBD. The platform pays for useful work in SBD. Why SBD and not STEEM? Because STEEM is too volatile a unit to pay for work, while SBD is much less volatile. If you ask for 100 SBD a day in your proposal and get it, you can expect those 100 SBD to be worth at least somewhat close to 100 USD for the duration of a small project whereas STEEM can crash or moon at any time.

As I said, there's not a lot you can use SBD for.

I bet you will find many more people willing to accept SBD than STEEM in return for goods or services on Steem. Why? Because of the greater stability of SBD.