April 27th marks my 7th day running a Mysterium node and my earnings are at 0.813 MYST (after subtracting earnings from the 28th).
Because of the way that dVPNs work, the amount of connections you get can vary wildly so your earnings can change a lot. The different types of users (public or verified businesses) can also greatly affect earnings and the rate seems to change throughout the day (possibly by country as well, but I'm not quite sure).

There's still lots of room for the earnings to change since it's really too soon to tell how much I'll be making regularly, but I'll keep my earnings updated.