2% tax is taken on every transaction and added to the GigaPool. If
you are the last user to buy GIGA from the pool (500k minimum),
and the following 7200 blocks (adjustable by vote) contain no
GigaPool transactions - you win the pool contents! If another buy
is made within those blocks, the timer is reset and the new buyer
is in the running. We expect the pool to get BIG!