re: 401k averages? Saving too much or too little?

For example if you make 50,000, your take home pay would be only about 1300 after taxes and insurance and you taking out a supposed 25%. So you would be making 2600 a month. So how in the hell could you save for a downpayment and save 50,000 in three years? Seems impossible. I thinks this board is going overboard with people trying to sound to frugal/money savy