Re: Does it work economically
"I suspect it's one of if not the most cost effective solutions launching."
Just because its cost effective doesnt mean its cheap. Cheaper than the competition perhaps, but your still looking at millions of dollars per unit.(I naturally do not have the figures, and have no relation to Rocket Lab, but Rocket motors and engines are always the most expensive part of the rocket and usually make up a very large proportion of the costs).
A 30m Superyacht is cheaper than a 40m Superyacht, but its still not what you would consider a bargain... ;)