Too many webmasters just don't care and it ends up costing them more in lost sales than it does to have it fixed. Then they pull the "Oh I did that on purpose" line... on purpose is ONE mispelling, not 12 on the same page. lol
Amazing what I find on sites that do pay me to have those things gone over. Small mistakes is one thing, but blatent ones stick out like a sore thumb.

I've even been asked to fix them for free!!!! I'm not a charity organization. lol