What I do not understand is how a small amount of

What I do not understand is how a small amount of both buying and selling has such a dramatic effect on the stock price and secondly, how such small blocks can create a profit especially with fees added. We are talking about fractions of pennies. If one sells or buys 100,000 share and the difference is .001........the amount gained or loss is $100 minus commission. Most blocks are only done in 10,000 or less........!0,000 x .001 is $10 minus commission. What am I missing here........