Very impressive intellect, very precise observation, highly skilled craftmen!
There must have been a specific and important need to fulfil for intelligent minds and delicate crafters to produce such and ingenious device... The savants working on it must have been taken care of, fed and shelters by all the other humans in that society working in the fields to create food and otherwise security...
Antique society do not waste human time and human skills, the arts and skills are serving the political power or a spiritual purpose, very different from today's world in which one could spend his life on an artistic activity that does not fulfil a specific purpose essential to the growth of a civilisation. We have a never before room for waste today, we even have crafted activities that allow us to "kill the time" (video games, TV, sun-tan on the beach, etc...). Something never heard of before in human history, unless in decadent ruling monarchial cercles.
So this machine, it is an evidence, must have fulfilled an essential purpose, if only that of displaying the power of one hellenic civilisation over another hellenic civilisation to bring about power, peace and propserity (*). But most likely an even more pragmatic purpose.
(*) same purpose that brought men on the moon in 1969.