Given commons are often the cheapest cards, this makes for a very affordable format that can contain surprisingly high-power decks due to the fact that Pauper is a non-rotating eternal format
With a business license, they could participate in allocation and get cards for wholesale prices
Machine monsters and their support are traditionally associated with pushing for extremely high ATK, with the effects of cards like "Power Bond", "Limiter Removal", or "Train Connection", but Machine as a whole covers a multitude of playstyles and effects, both offensive (e.g
I had the most amount of fun with the least amount of stress (and hits to my bank account)
Satoru Umezawa can give it cost reduction in the form of a ninjutsu ability, and ninjutsu timing lets Armaggon become an infiltration specialist that incapacitates key blockers
The scarcity helps the cards command a high price when they hit the market