yes, I do get more chances.  in an hour I could be in search of x amount of blocks.  if I was in an other pool that was half as fast I would be in maybe x/2 searches.  my daily income has gone up; I get what you're saying, but the theory isn't proving itself in my case.

think about everytime you start a block, you flip a coin.  if its heads, your search time is low; and tail, its high.  10 flips every hour will probably get you more heads than 5 flips per hour.