He has his supplement line Ronnie Coleman Signature Series which is meant to be huge. As in it's made him a millionaire.
Ronnie said he made way more from his supplement line than from competing. Now consider Ronnie made around $750,000 to $1,250,000 per year pre-tax around 2005 [as someone close to him posted on here at the time].
So my guess is that Ronnie is making a few million a year, easy. Add appearances and autograph signings...no doubt he's doing well.
And all the while, on 180mg of Oxycontin daily.

Ronnie has enjoyed his life, but like OneMoreRep implied, I'd rather he live much longer.
His mom died of pancreatic cancer in 2017 [Ronnie mentioned her death in his 2018 documentary, so I'm assuming she died the previous year]. That's a nasty, nasty form of cancer. You basically don't even know you have it until you're in Stage IV. It's absolutely mental to me. It's one disease you and I can have right now without even knowing.

Ronnie's mom had him rather young, if I recall correctly.
So if his mom only made it to around 70, without the history of gear abuse, how long will Ronnie live?