Well its not absurd its just most people don't do it which isn't bad at all. A weekly regiment is completely ok as long as your water parameters are good like nitrates lower than 15ppm or so. Personally I keep my nitrates around 10ppm or lower if I get around to the 3rd WC. I usually do 2-30% water changes a week some times 2-50%. The whole 50% a day is that the fish grows quickly. You can keep your fish your doing a good job with your WC.

Although a 50% a day could have the potential to throw your tank into a mini-cycle which can be straightened out fairly quick. Oh and your Avatar is absolutely HILARIOUS! I cracked up when I saw it. lol