Everyone hates spam pinging and it's a good thing that there's a mute button for it now, but it does have it's place in summoners rift. Think about it. You ping that mid is missing once and your bot lane decides not to listen and gets killed by your mid laner. Next thing you know, bot lane is saying something stupid like "nice MIA" and so what happens the next time mid roams? You spam ping the shit out of it.
Spam pinging the same ping does not have its place - it's distracting and annoying and quite frankly, useless. The reason the ping limit is 6 in a timeframe is so you can ping each ping once if need be, plus one/two ability/health/mana/alive pings if you need to. Not to ping one thing over and over again.
It's your job to ping it once. If people flame you because they didn't see your ping, it's their problem, not yours. Don't annoy the other 2-3 people in your game with spam pings just to impress and please one person who can't hear/see your single ping.
Eh. I ping MIA two or three times when laner is missing. It is harder to argue that there was no ping if done that way.
