Joey, I have around 150bf of unused 60 year old Brunswick bowling alley maple. I have made a handful of shafts from it. It's old wood, but still maple. It's not any better or even as good in general as good maple selected specifically for shafts. It's roughly the same ratio of use/lose as any maple. Some has runout, some warps, some just isn't good & grain count varies. I hand pick all of my lumber, sometimes even cutting my own trees. The bowling alley wood is not as good as my stuff. But it is 60 years old unused Brunswick bowling alley wood so there's some nostalgia & prestige that my "chosen" wood does not have.
I'm giving most of it away to my father to use as counter tops in a new cabin he's building. If you'd like a shaft dowel, let me know.