As someone who mercs,

Those people who want to clear are going to make party finders / learning groups and work for a clear. I join those groups at times and help people out. Over the last week, I've helped 5 people get their t9 clears.

But those who want to just have the completion / clear and don't actually care about knowing it, AKA buyers, are going to buy. Mixing these groups up is incorrect because simply put - these buyers aren't the ones going into learning / clear / farm parties.