Great Idea!
Job Specific
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Gathering
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1. for hitting certain levels like milestones such as 10-20-30 etc give the person a choice of a gathering tool, like an axe or something, or whenever you level up allow a person to choose a wood, plant, or seed depending on the level they reached.
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Combat
1. for archery, allow levels to be gained at a rate where you hit on a player, such as the head or mid section, giving more rewards for precise marksmanship and accuracy, this also goes for meebles earned. Also potentially add a system for new arrows being given out (Potentially damage boosters??)
2. swordsmanship rewards could be distributed by hit chain, more meebles gained the longer the chain without being hit, like in games where you have like a 96 hit count and you gain extra xp.
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Misc
1. Praise the lord BAKING IS HERE! For baking its simple, allow for a certain reward for an item baked and proportion. (potentially make a buff for smelt speed or money gain if this is possible?)
2. acrobatics could gain money from falls taken by height, without death of course. DO NOT ALLOW IN SPAWN. For milestone levels give acrobats featherfalling shoes and leap potions.
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General
I LOVE @PseudoGod 's idea for balance, as a .20 increase for level, that would balance nicely, although i dont believe there should be a cap? Make it extra hard to get to new levels, if people work for it there shouldnt be a cap, just make it super hard, like x5 the xp per level after 100. Therefore players will have to work for their money, like in the real world.
@junelawnchaired is completely right, i remember fishing with her all the time in oaklea and it literally is the funnest job ever. It got to the point where when i got on id go right to oaklea and spend almost 2 hours a day just fishing. (Also bear-handed lol i got that)
I like @junelawnchaired 's point of achievements, there should be custom ones (which will grant the prizes) that have some pun or are funny in some way like "Hot Stuff" if you make it to level 10 of the bakers job.
Thats all i really have for now. ill come up with more later :)