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The least generous and most degenerate interpretation for why people collect this is true for some people

Tinkaton can be obtained from Paldean Wonders Booster Pack in the Paldean Wonders Set

I'd grab a pen and have some paper handy to write on so that if you need to make notes about things that are harder to track because they aren't as visible ("Okay, I have his Teferi's Protection exiled with my Spelljack" or "Erin's graveyard contains three cards she can cast from the graveyard"), you have easy access to doing so

PayPal is no longer in the picture (eBay manages payments directly now), but don't forget shipping supplies, stamps, and your time