I've often gotten the feeling that Fleetwood Mac... Mick & Stevie most especially... don't feel like they're a "vital" and "active" band unless they're touring.
So, for the most part, I think the touring IS done for a love of the music, but I definitely agree that the money they stand to make each time, is a very compelling incentive indeed.
I said long ago that I'd rather have a brand new Mac or solo album every other year, than all of the extensive touring.
Maybe it's because I'm not a concert-goer, but the touring always feels like wasted time to me.
One more studio album... this time written from the ground up... focusing on the Nicks & Buckingham dynamic, would be wonderful, IMO.
And then I'd like to see at least one last album with the 'Rumours' five.