I appreciate and agree with the principle behind this post, but when a store wants to charge me for using the bathroom I either find a friendlier store or else I hand them the money with a smile and never buy anything from that store ever again.

There are certainly sources of knowledge that are not cheap to produce and which deserve our funding and our appreciation. But I am not going to give eg gated journals one cent more than I am absolutely forced to, and I consider it morally important to make attempting to profiteer off of other people's scientific research as unprofitable and unpleasant as possible.