Clients must choose only two out of the three options. They can't have it all. It's a reality of life, clients must deal with it. Designers must deal with it. 

Choose good and fast and I will postpone every other job, cancel my appointments an make up an excuse for my wife just to get your job done. But don't expect me to do it for peanuts.

Choose good and cheap and I will do a great job for a discounted price, but be patient till I have a free moment from paying clients.

Choose fast and cheap and expect a shit job delivered on time and all I ask for is a free beer.