Abe, i honestly would do that.
I'm often in no mood to craft things/hunt caps/do quests. There is usually no caps at vendors. When i get some caps, two hours usually lasted and these two hours i could spend more productive.
So, if someone has a more efficient way of getting caps, by trading or PvP or whatever, i'd really contact him and make a price. I'll spend money i earned at my work IRL, and i don't want to work in my free time for getting caps.
And if both sides are satisfied, that's only fair. However, in case of scam, i'd like to quote Lexx: "shit hits the fan when it comes down to money."