I've always been hell-bent on being able to travel Amtrak sleeper because it's such a great experience. I've never paid the highest bucket; before AGR if only high fares were available I'd find another date. So while most people probably wouldn't pay for transpac F, I certainly would (and do) pay for some Amtrak sleeper trips. The high-value ones I normally pay with AGR points. Just my personal preference, of course.