Contrary to what is generally thrown around in RP there is a sense of what the value of money is on Azeroth (with healthy room for interpretation of course).
1 copper can be used to buy a few vegetables, so it can be extrapolated a handful of coppers will feed someone for at least a few days. (Source is the Warcraft: Traveller novel, so pretty recent)
30 silver is enough to hire an Ogre mercenary (again from Traveller, and to note this Ogre isn’t considered quite smart, but is loyal)
50 gold for training a miner, 200 gold for an engineer and 300 for a foreman (from a Cataclysm quest in Blasted Lands) 300 gold can also buy a very fast speedboat (Also from Traveller.)
On the upper end of the scale Saurfang was offering 500 gold for a live Alliance spy and 1000 gold for a dead one (to note he was making a bluff but it is reason to believe the bluff was meant to be realistic.) (Source is from A Good War.)
So essentially we can make a loose pattern of what types of money are being thrown about. The average jack? Based on coppers for basic food, 30 silver for the hire of a mercenary and 50 gold for the training of a manual, working class job we can probably suspect a normal person may have anything from a few gold to maybe a few hundred if they’re good at saving.
The more wealthy sorts? Saurfang is a racial leader, throwing money around so it can be assumed this is money coming from national coffers. Exceptional figures like Gazlowe routinely handle multiple thousands of Gold on betting and salvage.
So figures like 50k gold? Fanciful if not probably the reserves of money entire businesses and cities might carry. Any more is likely farcical. Could a well off adventurer have a lot? I’d say anything between a few thousand gold upwards towards 10k-20k for the wealthy, well to do and savvy businessmen seems reasonable.
But for day to day living I suspect most would be trading in copper and silver, and only the more wealthier sorts in society would be trading handfuls of gold at most (unless they are exceptional individuals)
The Traveller books are incredibly good for small tidbits of lore we never see on a macroscopic level, like money and the average person. It’s nice to have a general framework to keep yourself right.