Crafters make things. Crafters cannot make a profit making things to sell to players who aren't crafters because other players don't really want anything crafters can craft. So SE put more crafting recipes into the game to provide things that players might actually want more of to enable crafters to make gil to afford things like ludicrously expensive houses.
And then they make many of them require materials you can only obtain by fighting something, or buying it from a vendor.
So basically, I can now make money but first I have to spend even more money.