Betting has been around since about april from what I can find. When they first came out if I remember correctly the was no cooldown or if there was it was very, very short compared to the 3 minutes we have nowadays. I don't really know why the betting lags the server, honestly if the betting secure became as bug (dupe) free as it could be, I would say increase the limit so people go broke faster, therefore decreasing the amount of bets.