How about you make zip files, each with a tutorial in. It costs say 10p per page on the tutorial. This would bring in alot of money, and i wouldn't mind paying!
How about you give an option to view the whole tutorial in one page. You can have more ads, have slightly less bandwidth, and people with un-predictable connection can load it at good connection, and still view the rest at less connection.I know it's take longer to load, but it can be given as an option.