$99 to have your site look like hundreds of others? No thanks.
If this is for your personal webpage, $99 might be too much. If this is for your business, and $99 can save you more than an hour or two of employee time, it's a steal.
Have you tried to use any of these?
How is their support?
Documentation?
And they are the same thing, templates from bootstrap or from 3rd parties: you get an example site with several pages, pages with building blocks on them, less based customization css on top of bootstrap, documentation which block does what so it's easy to find where to customize e.g. a header color / font.
If you're Seemless, competing with 10 other companies that do identical things, you probably don't want to also look exactly like them. If you're Cloudflare, Heroku, Twitter, Mint, Chase (or even Google), as long as its not hindering improvements to functionality or ergonomics (which it might - but also might not), who cares?
Meanwhile, primarily this is appropriate for small players. If you're in the early stages of building anything, you want to build your core product but have your website still look professional. The correct sentiment here might be: "$99 to have your site look as professional as all the others! Yes please."