I'm still failing to see why the prices should be reduced.
Some teams get heavy weapons like m4, m60 and other while other teams get just a colt stuby and a mp5.
Well this is true, but still don't see anything wrong in it. 50% of the players tend to choose for 'heavy weapons', and the other 50% for 'light weapons'. Besides, spawnpoints of teams with 'light weapons' are close to each other(same case with the teams with heavy weapons), while the teams that spawn with 'heavy weapons' are far away from the teams that spawn with 'light weapons', thus it's balanced in a way.
Though if you're speaking of the weapons clips of certain teams, then yeah it's kinda unbalanced.