CAPTCHA will not stop spam. Bots like XRumer have proven that.
Unless our wiki software was custom written, it is just like the thousands of other sites that use it .. which is why spam bots hit us.
Regardless, why go through the trouble of making images and creating a DB of questions/answers ? Just add 1 custom field into the reg page, like a checkbox. Then, any bot would have to be programmed to submit the extra data.
I have run a few sites with phpBB on them for several years and the only thing that has ever eliminated spam on them is by slightly altering the submitted fields. Every CAPTCHA mod I tried was cracked before I even installed it. Granted, phpBB is much more widespread than this wiki software, but the principal is the same.
There is a new trick spammers use .. they set up a free porn site, harvest your CAPTCHA image, post it to the porn site, make surfers solve it to view nekked pics, then store the answer so it can solve it on your site. Even the most advanced and unreadable image can be cracked this way.
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