My argument wasn't that sending influencers frames would increase the cost, which is given back to us by increasing prices. That is indeed marginal. But prices aren't made from costs, but from what you can actually ask for, what the customer is willing to pay.
Btw, I'm not criticizising anyone here, neither the influencers nor the companies looking for effective marketing. Doing that thing is probably in the best interest of both. It's just not in my best interest (probably true for a lot of people here in this forum) and I learned to speak out for that.