Guild Wars 2

I would like to propose a new booster sold permanently by the Black Lion Trading Company. The following items are usable by characters, not accounts.

• Guild Influence Booster
  Duration: One Hour
  Effect: Increases guild influence gained by 50%. (Stacks with other influence boosting effects.)
  Cost: 150 Gems

Event Effects:
Completing an event solo awards 3 influence instead of the standard 2.
Completing an event with 2 or more guild members the effect is cumulative.
Example:
1 Player: Event awards 30 influence.
2 Players: Event awards 40 influence.
3 Players: Event awards 50 influence.
4 Players: Event awards 60 influence.
5 Players: Event awards 100 influence. (Gains an additional influence boost because 5 members are using it.)

Dungeon Effects:
Completing a dungeon solo or duo awards 15 influence instead of the standard 10.
Completing a dungeon with 3 or more guild members the effect is cumulative.
Example:
1 or 2 Player(s): Dungeon awards 30 influence.
3 Players: Dungeon awards 150 influence.
4 Players: Dungeon awards 200 influence.
5 Players: Dungeon awards 300 influence. (Gains an additional influence boost because 5 members are using it.)

Player vs. Player Victory Effects:
Victory awards 8 influence per person.
Tournament Victory with 2 or more guild members the effect is cumulative.
Example:
1 Player: Victory awards 15 influence.
2 Players: Victory awards 25 influence.
3 Players: Victory awards 75 influence.
4 Players: Victory awards 100 influence.
5 Players: Victory awards 175 influence. (Gains an additional influence boost because 5 members are using it.)

Gold Conversion and Item Effects:
Awards 50% additional influence.

• Improved Guild Influence Booster
  Duration: Two Hours
  Effect: Increases guild influence gained by 100%.
  Mystic Forge Recipe: 5 Guild Boosters, 10 Vials of Weak Blood, 10 Glittering Dust, 1 Philosopher Stone

I came up with these items after read a few topics about how smaller guilds have little to nothing comparative to larger guilds. While larger guilds have better effects and more advantages, this would allow smaller guilds to work together to achieve the same goals as larger guilds.

Please discuss these items, I am looking for longevity of the items use vs. the consequences of adding them to the market.