For large enough companies I don't think it matters. They might take on consultants on top executive level but from the page you quote "Are you making over $2M

For large enough companies I don't think it matters. They might take on consultants on top executive level but from the page you quote "Are you making over $2M from your store, but haven’t taken the time to optimize it?". This is small potatoes for the larger companies and it is simply not worthwhile to negotiate individual contracts on the scale they operate. Unless you are on top executive level, maybe.