I don't think that I'm eligible to answer this so I'm gonna ask everyone a question!

How can an increase in fees for zapping, commenting and posting be productive for SN? If Stackers aren't zapping generously now, how can a rise in sats make them zap?

I had a look at the analytics and I can say it looked to me like a normal/regular dip. I also considered that in late last year and early this year, there was a big spike.