Here, you need to focus on a matter. The quality of the service providers matters a lot when you’re taking the services. If you hire a quality service provider who can check your website, understand your goal, design the perfect strategy, and apply it properly, spending on SEO is obviously worthy.
On the other hand, getting services from a poor-quality service provider won’t help you to experience the benefits. Thus, spending on such services would go in vain.
A good service provider would bring you the benefits you’re looking for from your investment in it. In that case, you can say that your SEO investment has ensured the expected result.
So, the answer to your question is ‘yes’ only when you spend enough bucks on optimizing your website and allow someone to do it who is good at it. I guess you’ve understood what I’ve said here.
