Indian Railway Catering & Tourism Corporation [IRCTC] — Passengers travelling with general class ticket in sleeper & ac

I was travelling in train 59460 saurashtra mail i had seen that passengers with general class tickets are travelling in sleeper & ac class coaches. Even the ticket checker is aware of the situation but does not do anything. If people with general class tickets travel in sleeper & ac class then why we passengers pay higher amount to travel in sleeper & ac class. Are we passengers fools to travel like this?? Or next time we will also take local ticket & travel in sleeper & ac class