So your saying there is a legit way to partial lag the game without you lagging???
They only change the values of prices to hex. Not much encryption there. Its possible to create lag, but its touchy and theres 2 problems with the packet sniffing way.
one, there servers could hold the errors that it catches since its still in beta.
two, if to many people report you, they might set up a packet send/receive protection script that sends a warning to a cache server.
League of legends is not in beta, it's currently in season 1.