I have read the entire thread. Based on all the above, I believe the OP is right and somewhat misunderstood here.
I believe this somewhat summarizes his entire assertion:
You are unable to answer what is bitcoin and what I actually get after buying it.
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What are numbers in your bitcoin wallet? Ownership of what will I actually get after becoming the holder of these numbers?
Antithesis, I think your thesis is correct. A buyer (or investor, if you will) gets nothing when they purchase Bitcoins other than numbers in some database with specific properties. That is an absolute fact that is impossible to refute.