Core Insights - A vending machine in a tattoo shop has generated a monthly revenue of approximately $300 to $340 after seven months, with a revenue split of 15% to the shop owner [1] - The initial revenue was modest, starting at $140 in the first month, but stabilized to around $310 to $340 by the fourth month, requiring minimal maintenance [2] - The success of the vending machine is attributed to the sale of aftercare products, which have high profit margins of 60% to 70%, filling a gap in the market where tattoo shops typically do not offer these products [3][4] Industry Analysis - Many tattoo shops do not sell aftercare products, leading customers to seek them elsewhere, creating an opportunity for vending machines to meet immediate needs [4] - Tattoo artists often focus on their craft rather than retail sales, which explains the lack of aftercare product offerings in shops [4] - The discussion around the nature of passive income in this context highlights differing opinions on the level of effort required to maintain the vending machine [5][6]