I threw in the crossovers just to make it a nice, fat, thirteen-issue TPB, and because I think of crossovers as What If's since they're not usually in continuity. Mostly though, it's just for the grins. On those occasions that I am in the mood for a Punisher story, a nice thick TPB makes me happy. If you're wondering about the Wolverine issue, look real close at the cover, and you tell me why it's here.
For the cover, I'd use What If (1989) #26, because it's the best What If? cover for showing a good picture of Punisher, and making you ask a question of "What the heck is going on here?"
Would you buy it? Let me know in the comments, and thanks for reading.