balls based pokemons are not profitable, and buying balls are good only to cover what little balls you're missed, while you can get free balls too.
i don't suggest to invest actually, using site for free is still profitable, i think you can make +2500 satoshi daily on the site without any deposit..
How they can cover balls i missed if i lose money just with buying it? I can always get new ball tomorrow. But upgrading with balls is for bigger earning from faucet, so it is kind of investment. And if you buy this pack of balls, you can only use them for upgrade and lose 3/4 money with them. But it doesn't make any sense why would someone buy balls for no profit? If there would be something what we could do with that balls(games, items etc) i would understand, this way i don't.