Because there’s a demo. Spiderweb Software’s Olden Skool CRPG is out now, and you can unlock the full game from the demo, I believe. Spiderweb have been going for quite some time now and, thanks to the pitiless gaze of their founder, Jeff Vogel, have never deviated from their mission. If Avadon tickles your interest them you should totally browse through their other games. There’s a fair few fantasy adventures to be had in there.