What you would enjoy even more is having those kinds of haircuts in-game.
Yes, thrusting polearms have very low damage so they give very low exp, it's ridiculous.
It was this before 1.1.0 I think. After that it's like Skjuld mentioned, defined by damage and also weapon speed. It's capped at around 60k to sell. This cap raises as your trading skill progresses.