I had another thought: these big tours may actually be handy as a great advertisment. As John said in the book, when the band is in town, there are posters everywhere, news, and such. A lot of people knew about DS because of that. So probably, without big tours, Mark and John may not be as comfortable as they right now. Would need to play in tribute bands like Trevor Horn, and not recording radio shows in your own studio drinking coffee and writing books. So hard work, in a way, paid off really.