Should I disavow websites that sell domains?

Theres plenty of dodgy looking sites with names like SEO helper, domain junky, site seller, etc that have terrible spam scores/DA and link to our site. I have disavowed a couple of sites in the past as their content was very offensive or adult. Is it worth disavowing these very spammy sites? Will they drive up the spam score of my own site if I leave them there? Thank you