Do you think this online publisher claim is true?

So I'm again trying to publish my board game without getting ripped off. I found a publisher which is highly rated by Google AI, and they claim that if you can get a potential customer to make a $1 down payment on a book or game ahead of time, then that person is 30X more likely to go ahead and buy the product compared to someone who made no down payment at all.

Do you think this claim is true? Evidently, this is how the company does it's marketing and product/buyer funneling.

Do you think this online publisher claim is true?
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