Instead of running a one off free month as a reward for referring people, why not have a recurring commission payment which rewards people for referring longer term more committed players.
This could be based on a percentage of their monthly payment, so the initial reward for signup should still be a free month but then leading on from that referrers should be given a kick back from the fees paid, either in real money with the refund transferred to them on an annual basis, or perhaps other point based rewards which could be accumulated to exchange for unique in-game items along the lines of the AUR system.
This would encourage people not only to get others involved in EVE, but also to help and support them in the early days so that the dropout rate begins to reduce and long term EVE accounts are created.
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