Professionally, for money, its a nice idea, and one day it will probably happen. Despite the laws the sport is still growing, as shown by the new sites and manufacturers popping up all over the place.
However, at the moment the sport is more of a hobby to most. One day, there will be enough sponsors on board to get it up to the likes of paint balling, and it might appear in TV format on Dave, or something. But, as another thread here discusses, airsofting just doesn't draw the crowds in like paint balling due to the lack of "accessibility".
And, think about the fact then when people start playing for money, honesty is more likely to go out the window. "Did i get hit, or was that a twig flicking into me?.... for £xxxx, it was definitely a twig".
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Not professionally, just for fun but in a structured way, would be cool. I think that this doesnt happen due to the fact
a ) again its a hobby for a lot of people who cant commit 100% of the time due to family and work,
B ) sites can make more money by just inviting everyone along to have a fun day - and the money is needed to pay for insurance, land hire, marshals etc.
30 people at £25 each, would be 8 at £90 each.
Also, when you say small teams, what size are you thinking? 4, 6? Both teams would probably move as a single unit, and the game would be over quickly. Breaking into smaller teams, for stealth missions would probably mean a marshal would have to go with you, giving away your position anyway.
10, 12? More feasible, but much more difficult to find 24 dedicated players.
Just my thoughts. I don't have much to do at the mo.