I seriously doubt that. Records don't make musicians much money, it comes mostly from concerts, and he is too stupid to handle money and make it grow.
They weren't around long enough, playing enough concerts to make that much money. Not near that much.
Can you post a reliable source proving that kind of worth?
The artist makes between 8 and 11 cents EVERY time the song is played in royalties, of which Axl get's 25% being the song writer. The band was one of the biggest band in the world for well nigh a decade. And they toured heavily. Their songs are played in every market in the US many, many times each day. Got to a sports stadium. You are likely to hear a Guns song as a players intro. All this adds up.
The artist usually makes @ 5% of the CD/Album sales... At 10 bucks a pop x 90million / .05 = 45million right there. Now factor in tour cash for 10 years, and lastly the 8-10cents a pop each time a Guns song was played for the past 20 years.
But alas no, I have no "credible" source for how much money the band or Axl made/has. And I searched pretty hard. I was surprised I couldn't find anything definitive on the subject.
Found an article where Axl bought some artwork for 2.7 million, payed half ish, and then tried to back out. The guy can't be "poor" if he's dropping 3 million on "art". (granted, he's being sued by the dealer for the 1.1 million he shorted them, but broke people don't give art galleries 1.6million bucks for art)