The Internet is packed with hundreds of thousands of cheap website services, most of them come as parts of cheap hosting plans, some are stand alone services. Pretty much anyone can build themselves a simple website.
While the website may perform the basic stuff you want it to, it will not be the best it can be, for many reasons.
Things like SEO optimisation, considerations for the best user experience, call to action button theory and a multitude of other crucial things that web design and development companies (like us) are likely to simply not be there, if you do the website yourself or if you hire a cheap bedroom coder. The things I just mentioned come with years of experience and are absolutely critical to building a successful website.
The cost argument might come up if you are just starting your business and want to reduce your spending, however you have to consider that a website that doesn’t sell you in the right light or makes you look cheap will not help you attract new business and win over clients.
If you don’t have a web presence, you don’t exist. If your web presence is not positive, you will be ignored. Playing a game of roulette is fun in a casino, but doing so with your business may not be the best idea.