Is marketing web hosting essential? A good analogy I can make is health; until you lose it, you don't appreciate what you have. When you're healthy, you can do the things you want to, but if you're sick, you must put those plans on...
Paid advertising is lovely for providing immediate results, but ad budgets are limited. Organic SEO is a better option for a longer, more successful game of raising rank, especially if you're starting and have a restricted budget.