This was really because of the incredible success of their Netflix biopic, "The Dirt." New fans wanted to know how they could see this great band. It's just not fair. They just get into the band only to find out they broke up (touring wise) last year.
The other thing is tickets should cost next to nothing because guitarist, Mick Mars, said something to the effect of (I'm paraphrasing here) when Mick was asked if they'd ever tour again...he gave the impression that could never happen and if it did, he'd play free and also get the other members of the band to do that too.