I don't really want to cheat though . I just want a sustainable method of gaining platinum through combat rather than running between towns, doing very little for hours. Are jobs from towns really the only reliable source of platinum?
In E+ at high levels, I've actually sort of stopped caring much about plats. It sounds blasphemous and counter to everything you're told about leveling... but they're too much of a hassle for me to bother. I still get them, but only the 2-4 or so from dungeons. As a result, I don't get to train my skills much from the trainers. And yet my potentials are all higher than they've ever been.
The secret is Big Daddies. When you hit high enough levels to take these down, you can reliably use them to keep all your skill potentials up. Eating a little sister gives something like +5-10% potential to all skills. Every few dungeons has one, and since I'm relying on dungeons for just about all my loot these days, it's actually really effective. And a hell of a lot less boring, shitty, and grindy than running the same quests designed for level 5 players over and over again. Of course keep in mind that this is very much a giant trade-off, as you're effectively giving up the ability to ever do little sister quests, which themselves have not-insignificant rewards:
http://elona.wikia.com/wiki/Little_sisterBecause yeah, getting plats is boring, shitty, and grindy. And you have to do a lot of it early on, sad to say. People have mentioned Yacatect stuff, but really, that's just a drop in the bucket compared to the big numbers of them you need.
However, there is something I noticed; not sure whether it is tied to fame or level, as I started noticing it when I sopped caring about keeping my fame down. Later on, quests start giving 1-3 plats, rather than just 1. So it gets
slightly better, but not by much.