Interesting! I probably wouldn't have done much better, I don't manage my lack of wealth very well right now. But the situation still is sad, that TSR did their best to screw both men out of profit, and that the money they did receive wasn't managed well.
Also seems ironic that Arneson received more royalties than Gygax, as Gygax worked to disenfranchise Dave early on. The whole mess in TSR's early days has always seemed sordid to me.
But to my knowledge, neither man died penniless and poor, which has been the fate of more than one beloved sci-fi or fantasy author.