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How did you find this out? Where could you find it?

crap I want to buy 100 packs but this wont happen with that amount of vouchers

You can calculate it using the numbers they gave above. They use a 100k SPS for an example at 0.1% of 33,333.333 daily drop but the breakdown is -

100k = 0.1
10k = 0.01
1k = 0.001
100 = 0.0001
10 = 0.00001
1 = 0.000001

thus 352 SPS x .00000352% = .11*** vouchers per day time 30 days basically 3.3 vouchers,

you need to add two additional zeros because we are dealing with fractions of a percent

Pretty sure thats right, I'm sure someone will correct me if I am wrong.

You can just buy vouchers from external market rather than staking so much sps. If you want to buy more packs.