Not if that's all you plan to do: complete one set. However, once you upload everything, you can continue to track the value with their SMR values that are part of your set registry.
You can also upload images of all your cards into an online album, so if people want to see your collection, you can forward them a link like this:
http://www.psacard.com/PSASetRegistr...x?setid=178133
It's up to you, but to me it's worth it.