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Eventually all stores are going to require a membership or deposit before letting you enter, like Costco.

I mean, you can just run into a Costco, grab something, and run out. No one can stop you.

In Costco's favor, they don't have a lot of valuable things that you can just walk with that aren't just a cardboard voucher.

Costco sells jewelry and laptops.

Yes, but are they where people can just pick them up, or are they in locked cabinets?