If marketing and SEO aren't making money for your business, then there's no point in doing it. The primary purpose of marketing is sales. SEO should get you to the top of Google for your most desired keywords, including money-generating keywords.
Once you've earned a rank, it's (generally) manageable to keep it there, making SEO cost-effective or sometimes free to continue ranking. This is the compounding benefit of SEO: your hard work pays off for months.
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