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It's not so much regret as it is envy.
The man on the stage who'd gone completely mad was just lucky, not only did he randomly get two "Nine Ox Power" entries, but he also got the "Self-Destruction Term". How many people could boast such luck? Now that's what you truly call a gamble on entries.
And Fat Long did not consider himself particularly fortunate. Even if he had another chance, he'd probably not choose the "self-extinguishing root". Pain was only one reason, the main reason he felt things were fine as they were, and the pleasures of the bedroom were, after all, quite enjoyable. Besides, aesthetically, it's much better than eight bloody holes and not as good as the Nine Ox.
One could only say it was fate, that this middle-aged man was destined for this fortune.