Is it fair that a 50-second song costs the same as a 20-minute composition? Back in the days of album-driven sales, track length didn’t matter much. If an album contains 50 tracks of 1 minute each (punk, grindcore), it would sell for roughly same price as an album with 3 tracks lasting 20 minutes each (post-rock, ambient).
Streaming services have changed this. Payouts occur on a per-stream basis. All songs treated equally. This means that if the amount paid per-stream is something like $0.005, Godspeed You! Black Emperor would make just 2 cents every time someone listens to Lift Your Skinny Fists Like Antennas to Heaven (runtime: 1h27m).