What to so with 16m of kamas?

Currently playing on mono, dakal 11. I have been making a lot of kamas with koli, more than I need. I don't need to buy stuff for the moment. My question is, do you think I should keep my money for later, as all the resource price has globally decreased since the server opened. Or should I invest it, buy a particular resource because the price will likely increase over time?

Edit : inkarnam resource ! (as loong there are no bots) all craft need these resource from lvl 1-20, so anyone who want to pex job need these. new players are rare, and group of these mob max size is 4