Since none of the residents can reach outside of the world of Genessia for presently undisclosed reasons, he would only have access to it if he opened up a subarchway to an area where his riches are. If he does open a subarchway to the space he keeps his treasure, he will be able to summon said riches to anywhere within Genessia. Unless he does that, he will not have access to his riches and will need to find other means of income.