Concise description:
Make the rank premium rank symbols more attractive than the Free to Play ones.
Specifics/Details:
Either put shiny bits or more ornate parts on the premium rank symbols. Perhaps the premium symbols could have gold AND silver parts or even gems that glittered to make them look really "primo".
How this will benefit the site and/or other comments:
This will benefit the site by making non-premium players envy the awesome looking premium members' rank symbols and have more of a desire to buy premium.
Most of the rank symbols I prefer the silver version (particularly Colonel). I pay for premium so mine should look cooler!