Aside from such musings, I make efficient use of the ignore list just to save time and to clear clutter. If you ever have any problems with users who want to follow you around obsessively and spit at you, then consider the ignore list as an efficient (non-)response.
Be extension you will find as your time grows shorter your list grows longer and its much easier to hit the show button to see if the quality of those you ignored improved over time.
Generally you will find they end up being banned anyway and the time you have left on this earth was not wasted on them.

The “show” button requires Javascript. Disabled here. My forum-usage security policy inadvertently makes my ignorelist ultra-hardcore.