According to Wikipedia, The Grass Roots achieved one platinum album, two gold albums, one gold single and charted singles a total of 21 times. Between 1967 and 1972, The Grass Roots set a record for being on the Billboard charts for 307 straight weeks. They have sold over thirty million records worldwide.
But seriously, taking one look at the members, can you imagine the groupies they must have had?? Wonder how they had time to even think of making music?