I wonder if you could deliver some ashes to this guy who lives in the same town?
Sure. You do realise he's standing right next to us in the inn, right?
Oh uh yeah sure whatever. It's easily worth 1000 gold for you to pass these ashes to the guy stood next to me
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Could you deliver some some supplies up a mountain for me?
Sure. I'm going there anyway so it's zero effort
Sweet. Have 750 gold for going to a place you were going to anyway
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But then
Could you go and kill a bunch of bandits who are armed, dangerous and have no qualms about killing you?
Sounds dangerous, but I'll do it
That's worth 100 gold
I don't understand why you automatically earn more money for doing simple tasks just because you're a higher level. You get filthy rich just by doing the equivalent of putting the recycling out. If money was a bit more scarce, buying a house and upgrading it would feel more like something you earned, instead of Bethesda treating the player like a spoiled child.
And it goes without saying what specific tasks are worth in gold is another item in the long list of things Bethesda put no thought into.