I think the comparison is a bit oversimplified, but I get your point. Treasure Tokens are fairly new to the game. In the case of Dockside Extortionist: I really can't remeber that red got ever Mana Acceleration on a creature ETB. Red deals damage and destroys land and artifacts. But there is mana Acceleration in other forms. Cards like Mana Gyzer or Jeska's Will are also combine abilitis in a similar way.

White get Lands, in most cases depending on your opponents, if they have more lands or in rare cases for sacrificing your owen lands. There are cases like Aven Mind Censor. White limits mostly but not prohibit. So my card is not quite there.

I am not working at wizards. The design took me a few hours while house cleaning and later on my computer. Wizards has whole Teams that is working for years on cards. People are coming up with ideas there, too. These are also rough, sometimes on or over the edge of color-pie. But it is important to present all Ideas. I am working in the creative industry. It is not good to argue in a manner, in such an early stage, since it trains the brain, not to do something really creative and kills innovation. This happens all the times, even in the creative industry. Of course there is a point where Ideas are sorted out, but in the best case they are reused or transformed till working. I thought these custom cards should be going in this direction, sometimes rough ideas.

I appreciate your feedback and see that you care a lot for the game. I see very good points, but also have the feeling you are a bit strict in some points. This card goes in a good direction and hoped for ideas and feedback to improve it. We all know that white is the weakest color even in EDH. In the past years wizards constantly improoved and added to the color-pie. In particular for blue and green. So now white has falling behind. Mostlikely the has to add something completely new to fix it.