Thomas Shey
Legend
But I don't accept that as given: See below.
The assumptions I'm making are:
1. The median income for characters of Nth level is N-squared gp per day. That applies to NPCs and NPC-class NPCs as well as to PCs and retired PCs. I drop the conceit that "1 gp is big money! Enough for an average 1st level NPC to live on for a week or more!"
I don't see any reason a PC has to follow that rule. That's at best a social construct, and PCs break those all the time. At a certain point luxury for luxury's sake is only what a subset of people who want money want; others happy to get enough and quit, and they can exceed what they'd make in mundane life as a PC relatively early.
Basically, I don't much care what the game theoretically tells you people of X level will want; it also tells you what various things cost, and you can cover pretty good ones much earlier and cheaper than those listed costs.
Now the "by the book" D&D background material tries to force the contradiction of D&D being simultaneously a Realm of Golden Glamor & Wealth and a Dung Age Place. If you really want to keep the second part, with its conceit of "1gp is enough for a 1st level peasant to live on for a week, 10 days, or even two weeks" then that calls for cutting my assumed figures by a factor of 10. And then yes, the wealth required to retire "rich" is cut down to something obtainable by a 5th level character with only a little more wealth grubbing than normal for 5th level adventuring.
And that's exactly my view.
But I find "1gp is a lot of wealth, in the mundane sense" to be an assumption that unnecessarily makes already-crazy D&D economics even more so. My judgment, my aesthetic sense - my taste, if you will - says to drop that assumption and so make things slightly less crazy.
That's your choice, but I'm talking about the listed prices, not what makes the economy make sense. The D&D economy has never made sense. As I said, I'm talking about what's already there.