The “engines” you are referring to which people love to build is called capital. In real life thats things like a business, farm, building, factory, website, facebook page, etc. And the natural system people gravitate towards where they can accrue tokens (money) is called capitalism. Moreover the unloved experience of having ones hard earned tokens taken away (forced redistribution of wealth, taxation) to feed other players is called Socialism. Its sad that the young people today say they want Socialism when in reality they do not. They want more likes and followers, better bikes, more places travelled, more certificates, more games, the want kickstarter etc. (more engines!) yet claim to want socialism!
Anyhow Im very pleased your games can teach young people the economic lessons they simply arent learning in school.