Also keep in mind, no. 38 usually buys a lot of stuff too, and hes' just a normal noble(or a mega-rich noble), AND, considering his lack of a mask, he probably buys extravagant things all the time. Claude, considering who he is, probably doesn't spend extravagantly on anything at all, outside of buying things for Ivona so, its unlikely the money he spent here at the auction is anything significantly financial-breaking.