10 km eggs definitely more common
Didn’t have time to walk all my eggs yesterday so had a lot of event hatching today. A lot of new eggs in the bag today. Three out of maybe 8 new are 10 km eggs. Saw a slight increase in 10 km eggs just before the event started and now I’m pretty sure it’s here to stay. Niantic must have seen a great drop in incubator shopping when you got maybe one 10 km egg every third week with a great risk for Skarmory.
Answers
I wonder whether the perceived increase in 10k egg frequency simply has to do with cycling through more eggs during an event.
When it isn't an event, I usually only incubate a pair of eggs at a time. During this event, I started to incubate a baseline of three (and more than that if I had more than two 10k's).
No, I think it is a real thing. I have been very fortunate in the past getting 10K eggs and I am now getting even more still. I noticed the bump in higher 10K drop rates a few weeks before the windy event which was a normal period of egg hatching for me. Niantic is pretty shrewd in knowing what Trainers will spend cash on and 10K eggs seem to be good bang for buck at 150 coins for 3 hatches. If I were them I would keep this going for a while. Incubators and raid passes are probably by themselves keeping Niantic in the black.
Yes this is definitely new, and true, that 10K eggs are dropping much more frequently! (Despite what the more negative posters here may assert...). Three others I play with state the same thing.
I just mass-hatched nine 10K eggs, and re-stocking with 7 new 10K eggs came surprisingly fast!
Now if I can just stop hatching so many damn Trapinchs! ;-/