You should always have some means how to counter that. Sniper can always retreat, when he spots someone that might be stronger and he wont stand a chance against him. However, big gunner hasnt got that luxury, so he has to survive some initial shots. With boosted sniper damage, that wont be an option.
Yes, that's why i propose a new weapon.
Meet the Sniper Bluesuit Avenger!
Not only it can kill those pesky snipers but it also auto-detects bluesuits in your vicinity! Upon bluesuit detection it fires homing bullets which effectively disable those annoying trolls. (A note to the moderator, your time would be better spent moderating the #2238 irc channel or should I say #avvramblings channel.)