I actually don't mind spam. Yes it's a pain in the rear end but all my comments have to be approved by me before going "Live".
I have not seen a difference in the amount of spam I whether I use dofollow or not.
I have my SEO blog set to dofollow because I don't have or intend on having a mass amount of links on my blogroll. Just ones I deem relevant so I find it nice to share "link juice"
KP
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