In the end, you go insane and broke:

During the first and second weeks of the ritual, sacrificial amounts are placed in special, once a day blocks. These blocks are a reward to the worshipper for sacrifice made. During the third and fourth weeks of the ritual the rewards build, small at first, then larger as the worship increases with fervor. During the last five days, the 'Tharanak shagg,' or "promise of dreamland," the ritual reaches final pitch and the daily special blocks are highly increased. Finally Cthulhu will return after the xx665th offering has paid tribute to the Great Old One and he will bestow a bounty deserving of Him upon one lucky worshiper. The ritual can be repeated after six months time, following the great halving.

Previously, previously, previously, previously, previously.