We know the rate of hatching rare Pokemon is pretty slim, but how many of you have considered the actual cost? Incubators cost a good 150 Pokecoins which can either be given by the defender bonus; 10 coins per gym owned. Or you could be spending real money towards the game to get the coins needed.
So, what is the average cost of hatching a Pokemon like Snorlax or Lapras? Looking at data from 9 10km eggs hatching all at once, you are almost certain to receive either a Lapras or Snorlax. It’s not a 100% thing, but the chances of seeing one or the other is pretty high.
The cost of buying incubators for just those 9 eggs would only cost you 10 dollars. Thanks because the 10 dollar package can get you 9 incubators. It probably actually costs around 8-9 dollars if you want to get technical. Something else needs to be factored in though. The chances of getting 10km eggs are pretty low.
Luckly, Wisp1971 has already gathered some data over the actual cost.