His band still have about 300,000 listeners a month on Spotify alone; that's millions of streams a month and probably plenty in other places. I believe he was still earning royalties until a few years ago but now they can confiscate royalties in cases like his. But he was still probably getting a tidy sum while inside.
Then again, I guess it's good that the other lads in the band still get money from their millions of streams. It would be shite if they lost out because of him.
I've always been a bit dubios about the other band members not knowing though. Maybe they didn't...but having been in a touring band myself, you live in such close proximity to other members, living in each other's pockets and joined at the hip. I couldn't imagine my band mates and people around the band close to my bandmates doing something and me not knowing or having a major incling. Certainly not accusing them of knowing details or anything, there's not evidence they did... but I'd be utterly amazed if didn't have any suspicions at all. Lots of his fans knew he liked teenage underage girls, it was no secret around the music scene. He had also been reported for the baby stuff a good while before the arrest from someone who knew the band...so there's no way it was some surprise to them, in my opinion.