That's just my personal taste, but when I find something I like I vote with a subscription to that station. It still works. Just differently.
That's the only way it works. But what happens when people just listen and don't subscribe? The statistics are around 7% of actual listeners become members. That's not good. Unless there's a sugar daddy somewhere (such as a college or rich benefactor, as is the case with KEXP), it will be tough to sustain. My question is why is this seen as a radio problem?