Instead of a wedding registry, a couple says they just want cash or checks. What do you give them?

So

Was talking to my friend about this and mentioned that I would want to tell everyone that they should just give us straight money instead of using a wedding registry. She said people will still get a gift instead even if we make it perfectly known we don't want any and prefer the cash/check.

I'm wondering if that's true? I just figure it'd be easier on everyone doing it my way but maybe that's just me.

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