I have not ( luckily, I guess ) seen a single ad except on the right for 3 of their sister / brother / she / manbun sites.
Or maybe there is no Rt. Hand margin at all - it is about 1/3 of the page and does not usually contain anything but site stat-type stuff.
And I had often thought of contributing... but lately... not so much.
I give $5 a year to Wiki & a couple of Nautilus Hating Clubs ( democratic fools they are ).