PHB page 144, Equipment, Wealth, Selling Treasure
Magic Items. Selling magic items is problematic. Finding someone to buy a potion or a scroll isn’t too hard, but other items are out of the realm of most but the wealthiest nobles. Likewise, aside from a few common magic items, you won’t normally come across magic items or spells to purchase. The value of magic is far beyond simple gold and should always be treated as such.
The above excerpt from the 5E rules seems to explicitly state that there isn't a magic item economy, so unlike previous editions you can't just waltz into a large city and score yourself a +2 flaming sword. Also, selling magic items requires finding a buyer, probably only getting a fraction of the item's worth, etc.
I like this from a fluff point of view, as I always felt that magic items never felt special enough, and adding scarcity does that. But: without magic items for sale, in a kick-in-the-door campaign, what do players spend their hard stolen loot on?
Once you've got the top level mundane gear and a stockpile of potions (which won't take long), doesn't gold become sort of worthless?
My group doesn't play D&D as a heavy simulation game, so while we could technically use gold to buy castles, fleets of ships and keep a family of twelve in an aristocratic lifestyle, or even just stockpile gold as an arbitrary score of success, none of that has an in game, crunch effect.
Am I missing something obvious?
For clarification, this question isn't necessarily about wanting to obtain magic weapons, more what you spend all that cash on if magic weapons are out of the question. As noted in one of the answers, this is the same as 1st and 2nd ed, but as noted in the comments, it wasn't necessarily a good thing and articles were written on what to do with all your riches…