If you've made it this far into reading Spawn, then you're somewhat invested in the story. Unfortunately, the story doesn't pay off, there is no reward at the end of the compendium. You will notice what Todd McFarlane soon noticed: he was running out of ideas for the story and was quickly approaching a natural end for Spawn's story. But, McFarlane realized that he had a hit title, so you will read a retcon and somewhat reboot of the story, as well as meandering side stories that do not tie to an overarching, well thought out plot. You'll notice how Simmon's origins are changed, how the real battle wasn't the one that was building up to being a real main battle, and more importantly: you'll see how McFarlane is making it up as he goes along since he didn't plan on making it very far with Spawn.
The only saving grace for this compendium is the art. This compendium will determine if you continue or drop Spawn.