Why would anyone hire a dev company, get charged $75/hr, have them drag on the process for 6 months just to get a website some kid in high school could have done himself?
Odds are, unless you're an ecommerce site or forum or some other specialty site, people are going to your website to see a portfolio of work and contact information. Thats it. Don't need to hire a dev team for $10,000 to design an online business card.
Why would you hire a marketing guy when you can just get a high school kid to write some words?
I'm going to go ahead and say most web dev companies know what HTML is. You might want to figure out what HTML is yourself before you give out website advice.
If you are doing a forum that is a case where you should use boxed software. VBulletin is pretty much the standard. It's a case where looking the same and working the same is good. No learning curve for users.
Ecommerce definitely hire a pro.
Info site for a company you should hire a pro. You want a good design so you stand out from your competitors. You want domain, dns, and email setup properly. Setup Analytics properly and more importantly understand what it's saying. SEO gets thrown around too much, but it does need to be done right. You might want Adwords to get more traffic. You need it to look good on every platform including mobile. Most sites fail at good content. Good content and a marketing plan are a must. Too many companies just throw a template site out there with bad content and no plan for marketing. Then they wonder why it's not bringing in sales leads.
A good web dev is charging more than $75/hr; probably $100. If you pay $10,000 then you paid way too much; unless you got a logo, content writing, marketing, or something else done.