You're all complaining about nothing.

If you farm materials, spiritbond/convert, craft, or gather, sell tomb materials, you will make plenty of gil.
I make minimum 100K a day.
Spiritbonding/converting level 49-50 jewelry set gives me 5 level III materia which I sell on market for 8K each minimum and can be done from just running dungeons. - Usually 50-80K a set.
Gathering materials through a gathering class like fishing, botany or mining works perfectly as some crafters would rather pay instead of gather themselves. - 100K+ per day
Farm materials like diremite web, fleece, snurble tufts etc - this leads to minimum 40K a stack, time varies for stack depending on competition.
Crafting - turn those raw materials you've gathered into base materials eg. Flax into linen yarn then sell on linen yarn on market - 50K per stack minimum
Sell Tomb Materials - You can use tombs to buy potash and other high end materials and they sell for 30K+ each and cost 125 tombs I believe.

Anyone complaining is just a sook and wants to just run AK constantly forever and still make millions fast.