Merse, the question is not how much money you spare by damaging the Pokemon. It is how much time you spare by trying to catch it immediately vs. painstakingly lowering its HP then trying only when it's almost dead already. I can catch a VR in a hour or two and sell it for 100k, covering my Pokeball costs for hundreds, maybe even thousands of in-game hours. However, server crashes can strike anytime, and even when the servers are stable, battles have a bad tendency to freeze randomly, forcing you to relog and swear loudly as you realise that shiny rare you're fighting is never going to be in your party. Extensive testing would be required to reach a conclusion, but I think just going in with the Pokeballs from turn one still works better.