payout stability of ghash.io, btcguild, eligius etc. is a myth.
The greater the proportion of the network hashrate a pool commands, the lower its variance will be.
That isn't a myth.
sure you get paid out with higher frequency, it does not mean that there is no variance.
No, it means there is lower variance, and your payouts will be more consistent.
Larger pools
do have greater payout stability, due to lower variance.