I can't speak for the admins or the owners but it is their website. It they want political ads and no political discussion that is entirely their prerogative.
But, I bet those are browser ads. I've seen them too.....but only on Audiogon.
There have been politics inserted into a number of discussions but they have not taken a political turn so it has not bothered me. Folks seem to behave fairly well in this regard.
My preference would be to see no politics here at all and usually that's the way it is. That's part of why I like coming here....get away from all the political noise and blather everyone is constantly exposed to.
