Mammon is more than commercialism. It was actually a deity worshipped in pre-Christian times. I'll share more about him below.
The demon Mammon is a Fallen Angel who rules in Hell as an archdemon and prince of tempters. The name Mammon in Aramaic means “riches.” He embodies the second of the Seven Deadly Sins, avarice. Mammon is equated with Lucifer, Satan, and Beelzebub. He serves as hell’s ambassador to England. --The Encyclopedia of Demons and Demonology
Here's an excerpt on Pre-Christian practices:
Mammon was highly esteemed and worshipped by the Phoenicians. It is also worth noting that Mammon is known as “Hell’s Treasurer” and “Hell’s Ambassador to England”. This isn’t an arbitrary claim, for it was in part due to Mammon-focused rituals that an isolated island state became the world’s greatest maritime power, following in the steps of the ancient Phoenicians who ruled the Meditteranean.
In both cases trade led to wealth, and wealth led to great political power and influence. What preceded their ascent was the work of magicians, not just the practical steps taken by men of action.
The article mentions five additional demons related to wealth. Practitioners would work with Mammon and others to achieve their aims. He's the overarching demon of wealth and the others have specific aptitudes.
He provides an example of working with Mammon.
As a simple example, a businessman could summon Mammon to help grow his business and profits, but he could also summon demon #2 to speed up the process and demon #3 to help him with the organizational side more specifically, since demon #3 is concerned with hierarchies.
If the company is in the technical field, summoning demon #4 could lead to great insights and ideas by the summoner or perhaps a close associate, which could lead to the creation of a very profitable product for the company. Demon #5 could be summoned to prevent the theft of ideas or human resources from competitors or to infiltrate their own ranks.
These are examples of serving Mammon. The practices are ritualistic. They pay homage to him the way we'd pay homage to God. You can't serve both because it's idolatry. Mammon doesn't appear because you like money, expensive things or lots of stuff. You have to summon him and pay for his help. It isn't free.
The world is full of greedy people. But they're not wealthy, famous or successful. He's not helping them.
~bella