My websites would fare a lot better unstyled than most websites built on top of frameworks like Bootstrap and their 'classy' HTML, but it's still not going to look good without CSS and no online business is going to make more money without CSS than with it.
I'm a big fan of terse, straightforward HTML, plus nice CSS on top of that. I've made (and get a lot of use out of) a basic.css stylesheet I built that supports a few basic themes: http://staticresource.com/basic-test.html
Let's see some of your HTML J_Darnley :)