Professions for just fun? Or also profit?

Compared to WoW's profession system, you're selling lemonade with Maple's professions, while WoW's professions are more akin to actual money printing machines. I can spend several hours just fusing earrings, and I'd maybe make about 20m-30m. In the Maple economy that'll give me potion money and maybe some low-end Alchemy buff potions, but it sure as heck won't be getting gear upgrades. Meanwhile in WoW, making a few hundred gold a day without even really trying that hard is the norm. In the WoW economy, you only need a fraction of that for HP/MP restoring items for the week, and can easily cover almost a week's worth of equipment repairs.

tl;dr Maple's Profession system is more for fun than for profit unless you really want to put in the time and money.