I can understand justifying ad-blocking, arguing that you don't want to see it. So even though you're depriving them of revenue while consuming the product funded by it, there's at least an argument that you're only controlling what you see.
But using tricks to get access to something not available to you without paying? This seems akin to sneaking into a movie theatre.
This isn't the equivalent of avoiding looking at something (your choice), it's the equivalent of breaking into a private business and pinching the products without paying.
(Cue the usual argument about IP, tangibles vs intangibles, and various dismissive remarks arising from cognitive dissonance)