M.ilk rate is an interesting metric.
I like Summit1g. In 2016
he leaked his own tips/donations page. (Rounding to $200,000/year.) I think he was around 10000 subs and was getting a higher rate at $3 each. ($30K a month.) Averaging around 17500 viewers in late 2016-early 2017 per Twitchtracker. At the time the average Summit1g viewer was worth around $32 to him each year.
DisguisedToast did
a really informative video on how much streamers can make. This misses sections of his income because he runs ads and has big sponsorships/sponsored streams, but he said that on Twitch he gets ~$2500 a month tips/donos and ~$14,000 a month in subscriptions while averaging 10,000 viewers. In tips+subs he sees an average of $1.65 a month from each viewer, $19.80 a year.
Twitchtracker had Phil averaging 400 viewers in 2018. If he has a range of $80-100K made on twitch, the average viewer is $200-250 a year to him, much higher than the other two examples. You could add Tevin's viewers to the average and the rate's still higher