It turns out that in your scheme of work, investments in the promotion are needed only at the initial stage? A similar situation occurs if there is a promotion for SEO. There, too, at first, you have to "dump" normal money into the CEO's budget. And then — there is a reduction in costs. You can even spend some time and not spend at all on promotion — there will be leads! I can say this with confidence after my experience working with a company that has been engaged in a Lead generation for a long time.