"Where are all the 10 Km eggs?"

#PokemonGO: This "hatchathon" says that we're more likely now to receive 5 km and 10 km Eggs.While this is only anecdotal, I've cleared all my egg space 4 times now, and the only 10 K egg I've seen is the one I got from Adventure Sync. I've also heard of similar lack of 10 Ks from my friends, and on several posts here.5 Km eggs are abundant, which was also the case before, and I'm getting 2 Ks about 25% of the time.Any research done on how common 10 Ks are? via /r/TheSilphRoad http://bit.ly/2LU02Hp