First article about the House pricing.

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just do a "spiritbond-evening guild event"

with 3-4 hours timeeffort you can easy make about 1 mio gil per person participating
that makes 8 mio gil per evening, if only 8 ppl participate
crafter materia are still expensive and will raise in price when lots of more ppl want to get crafter 50 with 2.1

and there are still many other ways to earn tons of money

sell primae kills, or just kill them for crafting ingredients and sell those

its so stupid easy to make millions without big efforts and it will be easier when all ppl get their "20k gil per day" (which means: more ppl get money and can spend it four your stuff)