No-follow links are not readable by bot. No-follow links are only good for Human Traffic which is still the best traffic you can have. There are may sites having No-follow tag, but those No-follow links can still send you traffic because we humans are not governed by the No-follow and Do-follow Markup as the Search Engines are.
Do-follow links are readable by bot and it's passes the link juice value. Do-follow links are good for Human Traffic and SEO Traffic.