Probably a fair rule to go by overall
But if I'd followed her rule I might not have read 'Fathers and Sons' through. The first fair chunk of the book I found extremely boring but at some point I became engrossed and to this day remember it as one of the books I've enjoyed the most.
Hm, maybe the algorithm could be refined to define a threshold of boredom; should this be met before 50 pages, use the remaining pages (50 minus pages so far) to randomly select pages to explore for more something exciting ahead.
