I'm curious about whether sex sells

But why would you investigate that by comparing promotion using attractive models (note: the fact that "model" has two quite different meanings is one reason why it would have been helpful had your original question been a bit more discursive) with random means of promotion? What you actually want to know is surely something more like: If you take some means of promoting a thing, and then make the minimum possible change to it that adds or removes a substantial amount of sexiness, what happens to its effectiveness?

sometimes my comments become redundant when a commentator rephrases or restates all points of interest

This is not sufficient reason for deleting them, any more than the fact that an employee has been made redundant is sufficient reason for killing him.

By all means edit your comment to add a disclaimer -- put it at the start if you like, to save readers' time -- but please do not delete the original text. If nothing else, it provides necessary context for understanding the responses.