Excess baggage

Whilst waiting to check in for my Turkish Airlines I watch the Check-in queues for an Kenyan Airways flight to Nairobi.
The amount of luggage, boxes and containers per family was frightening. I see no chance of the plane taking off whatsoever - it will be too heavy !
Box after Box disappeared down the belts, and having checked in, everyone trooped to the excess luggage desk to pay their due. I hope Kenyan Airways are not as expensive as Emirates - who charged me 300 pounds for an extra 15 kg, when I moved out to work in Sharjah