They just copy the same price everywhere because it feels fair and simple. But if a marketplace takes a 15 to 20 percent cut and the customer there is more price sensitive, matching prices is basically accepting lower margins for no good reason. That said, I get why consistency matters for trust. Customers do notice price gaps. So the smart move is probably not changing the base price but adjusting shipping, bundles, or promotions per channel. That way you protect margin without creating visible price differences that confuse buyers.