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Jonathan Kehayias has a great post on TF 7471 on SQL
Statistics will continue to be created on single columns when queries run as long as the “Auto Create Statistics” database property remains on.
The SQL Server query optimizer uses statistics to estimate how many rows will be returned by parts of your query. By default, the SQL Server optimizer will see that no statistics exists, and wait while two column statistics are created on the First Name Id and Gender columns.
Statistics are small, and are created super fast– my query isn’t measurably any faster when I run it a second time.
Even if you have a statistic on every column in the table, this is a very small amount of overhead.
Statistics take up a negligible amount of space compared to indexes.