Some of it is saving over time, but your plat-making gets huge improvements as you level. Certain camps that are profitable become available at later levels. Also xp-ing in higher level zones can get you fancier loots that you can then tunnelquest for ever shinier piles of plat. Hell, at 55+ you can go to seb and try win your own fungi, which you can then wear or sell to buy epics or whatever.
It'll take some time but in your 50s you'll start seeing the cash roll in. Remember, there have been people on the server for years farming the seafuries or hillgiants or sol a goblins or selling jboots mqs or entire epic mqs etc. there are tunnel animals that literally can't move under the weight of held plats. It'll be a while, but you'll eventually find yourself breaking 5k, 10k, 20k etc not having anything specific to buy in mind.
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