I was wondering if those who have boats on the water already would be able to comment on how the boat responds to water ingress. If water gets in will it cause the stern end or the bow end to go down... bilge pump towards the stern (volcano area) would mean a lot of water would collect before it actually causes the float to operate the pump! If it causes a more bow down stance then that would lead to even more water collecting and miking the story worserer!
Greg, unless you're in heavy seas, with your companionway open, or a port blown out, or knocked down with cockpit laz open, there's not going to be any water ingress into the "bilge" area IMO. When properly buttoned up, the only significant water would be into the cockpit and the drains take care of that. Because there is no real bilge in a C22 there is no single "low spot" for water to collect enough to trigger a pump float unless catastrophic hull (or volcano) damage were to occur...and no pumps will keep up with that anyway.
I actually bought a good pump to install early on (thought it was the prudent thing to do), but after giving it some thought and realizing the above, it went back for a refund. (We keep a hand pump, bucket & sponges aboard.)
That said, I do understand it is required at your marinas, so I'd buy a <$50 pump for show, hardwire it to your battery and be done with it. Odds are, it will never be used.
Speaking of catastrophic, hopefully none of us will ever find ourselves in this situation! (warning, hard to watch)