Most games that allow hi-cap use have strict rules, such as; you may only carry one hi-cap at any time, and are restricted to semi-auto fire. Many of the prominent or competitive airsoft teams or places are getting, or have gotten away from their use entirely.
Apart from the realism aspect, the really are a hamper to the skill or functionality of the game. The ability to dump three hundred non-stop rounds down range does nothing for you. I've seen people even run three thousand round drum mags in an M16 and a G36. It takes away from what all "true" airsofters are working towards; which is highly effective equipment to enhance the game/sport. Congradulations you have a wind up toy that gives away your position.
For instance; we allow box magazines as long as they are on a proper LMG, and being used in a support role. If you want to waste that much ammo, then you have to carry the weight and do the work. This is simply a rule from our field, albeit not an uncommon one in the community.
Even if you are attending a game/field that allows the use of hi-caps, expect some disdain from other players. Hi-caps are often associated with young, lazy, inexperience, or toys. Not that this means you, or that it's your intention; but a generic stigma is attached.
Honestly magazines are not generally expensive, or difficult to obtain. But the bottom line is "where" you play, and "what" their rules are.
ďREALITY IS LIKE A STONE. TO MANY ITíS HARD AND COLD, THEY CANíT HUG IT OR EAT IT, IT ONLY FRUSTERATES THEM AND DOESNíT DO THEM MUCH GOOD. TO OTHERS ITíS STRONG AND DEPENDABLE, YOU CAN BUILD WITH IT, BUILD UPON IT, OR WORK WITH IT, ALSO USE IT TO SMASH PEOPLE IN THE FACE.Ē