Minnowbooster doesn't give Delegations from them they just provide a Market for two users to meet. Most of the times delegation requests go without fulfilled so it is necessary to talk with users that are interested in Delegating before hand.
Another thing is that I am currently offering Upvotes which are equivalent to 15x of the amount someone delegates to me. For example if you delegate 1000 SP to me I will up ote one post per day of yours with 15000 SP weight which is basically a 15x ROI daily.