I dunno, flooding the new world economy with the ludicrous amounts of gold that the tomb has is probably a very bad idea. Word will get out very quickly and they'll have an army at their door, potentially including other Level 99 player characters. Like showing up in a favela and asking if they can cash a travelers check for $10,000.

He already screwed up without realizing it by giving out a potion before seeing what the denizens of this world are capable of making on their own.

I imagine he thought about the gold, but missed the less obvious aspect of giving away super rare items that he (as a caster/crafter) feels are basically trash.