I think that they were making more money with the tours than with the records by those early years!
Maybe they were thinking eternity already. By half 1965 they knew their time as a live band was soon to come to an end. They knew they would be recording artists rather than performing artists. And records last longer than a performance.
Ok, What You're Doing is probably not their strongest song, but it is catchy. There are other albums that have far worse songs on it. As an album, I'm going to have to say overall it's great. It sounds like they're moving a bit towards all that would follow. A small transition, if you will.