Like with the glove attack inflation, when something lots of people have (ores) inflates, everything inflates. Suddenly people all sell their glove atk for 15-20mil, have way more money than they expected, and spend it indiscriminately. Maker isn't gonna make even a dent in the billions of mesos around, because most people won't actually appraise their diamonds - they'll try to sell them for massive profits.
New features increase circulation of mesos, because the high fund characters who hoard mesos start spending them to upgrade their gear - that money was sunk into someone's idea of "my gear is the best possible" and when it unlocks prices go up. Once they've spent their piece, got their well scrolled perfect maker gear, then the prices will start to drop - but until then they can essentially introduce unlimited mesos into the economy in pursuit of their new gear.
New features increase circulation of mesos, because the high fund characters who hoard mesos start spending them to upgrade their gear - that money was sunk into someone's idea of "my gear is the best possible" and when it unlocks prices go up. Once they've spent their piece, got their well scrolled perfect maker gear, then the prices will start to drop - but until then they can essentially introduce unlimited mesos into the economy in pursuit of their new gear.