Indeed these games are a good buy if your really into arcade retro 2D beat-em ups. For me it was a solid buy given my love for the arcade version I played and my wish to own the collection on the sega saturn import.
I can understand why some would wait for 15 is rather high. But consider the cost of the arcade, the import and I'm sure the licensing deals that had to be made with TSR, wizards of the coast and whoever else was involved, it's a marvel this games been released.