Who would you consider wealthier:

I always imagine Charles hiring a TON of specialized technicians, engineers and construction people to build and rebuild his mansion and the X-Men facilities.  And and the end of the job he pays them handsomely….and mind wipes the whole experience from their heads!

LOL!

I'm thinking he may have worked with Tony Stark or Reed Richards approved contractors.

:-)

On a side note, would Charles be the type of person to use his mutant ability for any financial gain? Perhaps the ends justifying the means by making sure a stock purchase allowed for a new danger room? =)

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Outside of the first few issues of the series, my X-Men knowledge starts with the Neal Adams-Roy Thomas era, so there's certainly a lot I don't know, but my impression has always been that Xavier's wealth is inherited. Even the name--Charles Xavier--seems like a name Stan would choose for a character with old money. So no need, in my opinion, for illicit gains, because the money was already there. And that's to say nothing of the fact that he's a hero, which is more than likely the reason such acts were not traditionally built into the character.