Unfortunately, in certain Indian families it has become tradition to use plastic disposable table covers, plates, glasses, and cutlery for their events to save money. Given our high guest counts, this is a LOT of waste. However, you can consider the planet for a minute. Not to mention it all looks uber-tacky!!
I say don't use any disposable plastic unless absolutely necessary. If you must, buy renewable and/or biodegradable products from a vendor like Green Home.