not sure about 3rd abilities, but in another server i think u can buy like a fast reload perk, maybe thats what its for , i dunno.
i think ayaq and ramistar and kid have played a lot on other ROTU servers, they may remember more than me.
but i will tell the regular players to come check this post so they can add more ideas.
i agree with you, the upgrade isnt an upgrade at all for the primary.
Actually i dont even care anymore about about primary, i just get the DE, and then i spend the rest of the money on turrets, TNT and some barrels.
but now if the DE is nerfed down, and u have to upgrade the primary too, u would need a big amount of money, so we may have to change prices or something for a better balance.
sometimes i go and buy special weapons, but again, the raygun doesnt work at all, so u need lot of money to upgrade to a decent weapon.