Whoever told you that you don't gain anything from having a high level crafting jobs is dead wrong.

It is not as lucrative as it was in 1.0 but you can still make a ton of money. But if you are looking for some quick ways to gain gil without crafting try selling stacks of low level crafting mats that can be purchased from vendors. Things like Rubber, Rock Salt, Mineral Water, etc. They can all be purchased for next to nothing and resold on the wards for 4-5 times what you paid. People know there are vendors that sell them but would rather just pay at little more and get what they need in one place and not have to run around to find them. Its not a huge profit but selling a few stacks a day can earn you 5-10K depending on your servers market.