You need to understand how the pool rewards work.  When many miners work together on the same coin and find a block, you don't personally get the entire block reward.  You get a fraction of the reward in proportion to the amount of hashing that you contributed to the pool.  For example, if you contibute 20 GH/s over the entire time, and the rest of the pool contributes 80 GH/s, then you would get 20% of the block reward.  This is complicated by the fact that H2C is a multi-pool that switches (those who choose to allow it).  So during the time that you are mining, the pool might direct 500 GH/s for a portion of the time.  Unless you're constantly watching what the auto-switch is mining, you would not even know this.  But when the reward is divvied up, the "shares" contributed by the other members of the pool are included in the total.  If you're familiar with calculus, think of your share of the reward as the integral of your hashrate x time divided by the total of all the integrals of hashrate x time for all of the other miners.

Understand?