I think you’re completely right, this is a special case of the problem of induction. The Stanford Encyclopedia of Philosophy has a wonderfully exhaustive article about it that also discusses subjective Bayesianism at length. Among other things, that article offers a simple recommendation for taw’s original problem: intersect your proposed reference classes to get a smaller and more relevant reference class.
I think you’re completely right, this is a special case of the problem of induction. The Stanford Encyclopedia of Philosophy has a wonderfully exhaustive article about it that also discusses subjective Bayesianism at length. Among other things, that article offers a simple recommendation for taw’s original problem: intersect your proposed reference classes to get a smaller and more relevant reference class.