At some point in the distant past I started to get spam posts to my blog. I switched on word verification for comments and they were no more. Then a bit later a there were complaints from some readers about trouble with word verification.
I was sure it was going to be the end of the earth, but I switched word verification off. I did not get any spam comments.
So just some gentle advice. Try turning off word verification and you may not get spam and it makes your blog a bit more friendly.