Just curious - do you believe Reason and Logic are gifts from God? Not trying to be snarky, genuinely wondering...
How many people can a person listen to at once? Logically, it would be ridiculous to expect one person to be able to really listen to millions of people at the same time.
If I accept that it's possible for Mary to hear prayers, and if I accept that she can filter out millions of prayers to hear a single individual, that means that you're better off playing the lottery than praying to Mary.
We have a promise when praying to Jesus. The pseudo logic of praying to saints is so full of unsupported assumptions that I can't find the benefit other than a placebo.