I always got them confused with “Grand Funk”, another band of that era.
There are a few bands from the 70’s that fit in the same category - fairly big at the time, but didn’t seem to survive in the public consciousness. Sweet would be another example. If it weren’t for the novelty of “Ballroom Blitz”, they probably would have been completely forgotten by now, but they had a few big hits back in the 70’s, like “Fox on the Run” and “Little Willie”.
I think what kills a band like that over time is artistic inconsistency. The critics don’t like them, because their hits are interspersed with an awful lot of filler. It also means none of their albums are real ‘must haves’, so they drop out of the music stores and until digital music came along, the only way to get these songs would have been on something like a K-Tel records ‘best of the 70’s’ compilation.
Other bands in that category:
Stealer’s Wheel (and Gerry Rafferty solo): (“Stuck in the Middle With You”, “Baker Street”)
Bad Company (“Fee like Makin’ Love”)
Thin Lizzy (“The Boys are Back in Town”)
Deep Purple (“Smoke on the Water”)
They’re in that category where they aren’t one-hit wonders, and had significant success at the time, and then dropped off the radar as a band.