It's really hard for me to imagine or come up with an anecdote where a sales process or marketing initiative has had more than a linear multiplier. It could be 10x, but even that is usually very big. Never exponential, or even quadratic (though in network effect businesses the quadratic amplification via marketing sometimes exists.)
Have you ever started a company that successfully exited? Or managed a product from cradle to grave?
There is another comment in here about perspectives gained from taking on multiple roles. If you can’t think of a single case of a great salesperson adding multiples to a product’s performance, I gently suggest broadening your scope.
more than a linear multiplier
Read more carefully.
BTW, ever heard of word of mouth advertising? That's by definition exponential.