[Kailhus]

You are correct, the ticket prices will be agreed between the promoter/venue (LN) and artist/manager via the booking agents.

The venue, often LN, will charge a base rate then everything else goes on top.

There are several other factors at play that lead to higher ticket prices which often comes down to the artist and its tour production being very expensive rather than pure greed

More often than not the deals are worked out on a 70/30 or 80/20 in favour of the artist and split after breaking even on most mutually agreed costs (ads etc), or a bigger artist flat fee which is risky for them.