I don't see a big difference between Helpful votes and "Suggest this thread for TalkMail". Nobody has ever asked for ability to prevent others from suggesting your thread for TalkMail.
In contrast to the “like” button system, submitting suggestions for inclusion in the
TalkMail newsletter is completely anonymous to fellow FlyerTalk members; is not “invasive” to the profile of a FlyerTalk member; and submitting a suggestion does not automatically guarantee publication.
After all, as you said...
No consequences should flow from vote count of your posts, other than a possible inclusion in TalkMail or a curated FT home page. Both of those are built by people who can read.
By the way — what is with you and the number 666?!?