Bye bye my dream of getting the Legionnaire title... unless they'll count purchases made after the presale as well. I'll probably aim for 500 as well. And that's because of the voucher limitation, otherwise I would have gone for 1000.

There might also be a sort of phycological game. Because there are only 1m packs in the presale, and vouchers will be drip-dropped. So they won't go right away, but you can't know when they go either, because people might amass vouchers for the extra bonus of buying in bulk.