This sums up your attitude very succinctly. If you remember the original issue, it related to moving over (or forward) so a car behind you could make a right turn. This isn't a question of unnecessarily stopping to waive someone through an intersection, which I agree might create problems. This is a simple question of extending a fellow road user a courtesy at no expense to yourself or any other road users.

You clearly feel no obligation to do so, and I agree that there's no obligation, but I do so anyway because it's the way I am. Sometimes it's not about finding a reason why, but not finding a reason why not.