What if I ask a question, and get no good answers. This is hurting my accept ratio... but not because I'm too lazy to mark one as correct, just no one has posted a reasonable answer. Maybe it's not a terribly important question, so I don't want to start a bounty... what can we do? Can we at least flag the question as "given up" or something?
Have you really invested the effort into getting your questions answered?
No one expects you to maintain a 100% accept rate. If you have a few questions that didn't generate a good answer, it's not that big of deal.
It is considered good manners to accept answers on your questions, eventually, but accepting answers is not required. I personally consider anything at 70% or over quite good, meaning you accept answers on 7 out of 10 questions that you ask. There are certainly cases where you don’t get an answer you like, or the question is inherently unanswerable.
Community Wiki questions don't seem to affect your accept ratio, at least from what I've seen on a question I asked that I started as CW. Maybe marking as CW will stop it from being counted in your accept ratio?