Some people may not feel it is necessary to deface a perfectly functional case by chopping holes in it. Although they may feel that a project of this nature is overkill, and will not increase performance, I tend to disagree. The reason we want to mod our cases, and add fans to them is to increase airflow, and lower temperatures. When we lower our temperatures, the systems are generally more stable, and will last longer. In some cases, lower temperatures mean that we can push our systems one step further, which is reason enough for most of us!