It could be a similar situation to Brian Eno's assessment of the Velvet Underground's first album - "Only about two hundred people actually bought it, but every one of them went out and formed a band."
I'm watching it now and I remember them at the time. They had a few hits but they were never that good or influential. It's only because of band aid/live aid that Bob Geldof is as well known as he is today.
I liked them - their first album was excellent, and I think Geldof's stage presence when they played Rat Trap on Top Of The Pops was just like an early Mick Jagger.