I have heard a lot of people say and believe that "if your product or service is good, it would sell itself". That's not entirely true.
Marketing is indeed important to spread awareness about your business especially if you're just starting. There should be an allocated budget for marketing and this is for people to know your product and became known to others. However, make sure that your product/services offered are one of the best, because marketing is useless if your product won't meet their expectation. They will just come and go, and just tried your product if the advertisement is really true since it's attractive.
We have also a repair business. We're making sure that every customers leaving our store are satisfied with our service so they can recommend us to others. We market our business through social media since it's free. So far our business is still running for a few years now.
That's right and right now marketing a business through social media is very effective and profitable because it's free and the reach is very wide and also right.
And indeed quality and promotion must be comparable and evenly distributed between the two, if the quality is good but without promotion it will not work well and vice versa if the promotion or marketing is good but the quality is not good it will not be successful so I think these two are important things that must be carried out with sync.