The Novus itself isn't a Time Sink. In fact creating a Novus weapon probably only takes a good half an hour. The Time sink is getting the materials to make the weapon in the first place. So if I want to spend my time sink making a profit while working towards my Novus weapon, I am by all means entitled to do so.

If you on the other hand would rather spend a couple million gil, and go bankrupt to achieve the same goal. By all means feel free, I am sure the crafters who made the materia you are buying will thank you for giving them your hard earned money.