The real question is why bother to focus on one side at all? There are plenty of cards on both sides that increase the power of the other side. As for you claim that Red cards are more powerful I would argue that green cards are more powerful.
Depending on what cards are available a green deck has lot of power and its all in how the cards are used.
Baby Ninja: While it adds +1 power its great to have for pvp defense (and you get a replacement card) and it can be used with other green cards
Magical Unicorn: Great for getting rid of a bad hand.
Bat Milk: Doesn't give much by itself but it can be used to get a replacement card that is more valuable and it can clean your deck of red cards if you are going pure green.
Robot Cowboy Angel: Great pvp defense as you get 2 cards back and if not needed for pvp defence you can just draw another card in its place.
Faerie Candymancer: Great for removing pox cards since you can draw another card and it can get rid of red cards.
Psychic Cat, Stone Yeti and Hawkman with a Laser Gun: Great card for early on where you can discard a quarter and a cardboard tube to get 3 Tokens.
TochWieners: Free card if your opponents also get them
Natural Twenty: One of the most powerful cards in the game once you start using two of them since they are cumulative in power. Throw two of them on a Werewolf with a Top Hat and you got a total of 12 tokens and 12 power for 3 cards which shows you how quickly they can give you tokens/power. That combo can allow you to buy both red and green boss cards while not worrying about other red cards.
Sorcelator: How can you go wrong with 1 token, 1 power and 1 card?
Pickle Recognition Engine: In a green deck this will give you 5 tokens most of the time and combine it with a few Natural Twenty's and you will soon have the ability to buy multiple boss cards on a turn.
Werewolf with a Top Hat: 3 tokens and 3 power combined with Natural Twenty is a great way to build up green cards and grab red boss loots before your opponent.
Sure the only green cards with victory points are the boss loots but the cards have the ability to help a player build up quickly.
In the end the decision to go with pure green, pure red or a combination of the two really depends on what what cards are available for the game. Nothing is set in stone when you can get a game with 9 or 10 stacks of green cards then it would be silly to worry to much about red if they didn't have many cards that help you get the boss loot quickly.