User blog comment:Emptylord/Custom Champion - Milo the Sunfire Alchemist/@comment-4834593-20121010183754/@comment-3974211-20121010195710

After doing some calculations, I couldn't create a reasonable level-up incentive... until you got to 2.75 AD for 100 gold, it wasn't worth it (meaning the skill was pointless until maxed). In order to use a flat amount, the skill had to have a different level incentive. It now grants a flat amount plus a percent of his gold.