Effect on image of a vanity award on CV/Profile
If I saw a vanity award of this type on somebody's CV, I would have a hard time ever taking that person seriously.

At least with predatory publishers, there is often a reasonable excuse: it's easy for people early in their career or at smaller institutions to get tricked by the slicker operations.  Indeed, sometimes the line between low-tier venue and vanity publisher is quite unclear.  As a result, real, sincere scientific work can end up getting sent to a horrible venue. It's unlikely to be very good work (just by correlation, since poorly connected researchers are less likely to be producing good work), but any shame associated with such a publication can be readily diluted by publishing good publications in good venues.

A vanity award of the sort you describe, however, I can see no such mitigating circumstances. When random people you've never heard of before ask you for money to call you "Scientist of the Year," you can only accept if you are very gullible or very vain.  Moreover, unlike a publication in a bad venue, there is no reason to keep such a terrible award on one's CV unless you still believe it is somehow valid.

In short: I would consider a vanity award on a CV to be quite ridiculous, and a good reason to have a high degree of suspicion of a person's work unless given strong evidence to the contrary.