This has been my experience over the years as well. My conclusion: tube rolling, in general, just isn't worth the effort or the expense for me personally. YMMV of course.The thing about rolling tubes (of the same type) that kinda surprised me the most was that the tonal differences between many of the different vintage tubes was not nearly as big as I expected... the differences ARE real, but they're also really subtle. The biggest actual difference I notice is when driving the tubes hard: some go into distortion noticeably earlier or later than others, and I often hear a bigger difference in the character of their distortion more than any of their tonal differences played clean. (But that's just to MY ears...)
A lot of people claim that good condition vintage tubes will give thousands more hours of life than modern production tubes will; but I've never found anyone that's ever kept remotely accurate track of how many hours any given tube was played before failure. Also, the numbers on "early" failures are deceptive too because most of the still existing old stock tubes have already been QC sorted through in the secondary market in a way that new production tubes haven't been, so no clue if it's actually true or not.
Tube rolling can be an interesting (and expensive) sub-hobby, but don't expect anything dramatic and don't invest too much into it; unless you really like the early/late distortion of one tube versus another, the tonal difference is usually about the same as trying different manufacturers strings of the same gauge and type.
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