The Dolphin category is slow...that is true.
Although even at these prices, 5000 SP is still about $2500...not an outrageous amount but still a lot of money for most people.
As much as I would love to see the Dolphin category growing at a faster pace, I think the Minnow class is more important. If we can get that number up to 20K, that would really change the distribution of STEEM and of the reward pool each day.
It is going to take some time but it is possible. Getting to 10K Minnows is the first step.