I'll opt NO...and if Storyblocks continue changing their planes for destroy the market I'll delete my library.  They were ok at the begining, but now they are very dangerous for all the professionals producing stockfootage.
I think could be great to do a massive delete of libraries on their site.
I have 3500 clips and 1 sale average by month, or less. I don't care to lose it.. While in SS I have around 30 - 35 downloads by month... If we participate on their program we will lose our sales on the others sites, for sure. Storyblocks will have all our content, and paying pennies for it. And costumers will move to Storyblocks and will stop buying in the pro sites..
If anybody have doubts about this program, and is happy doing this work, please opt NO for continue having the chance of producing stockfootage and be professionally rewarded for it.
Make your work worthwhile, do not give it away!