Something can be neither luxury nor necessity. Coffee is one example.
Coffee is a luxury. It is a very carbon and labor intensive product of growing fruits in tropical areas, only using the seeds, throwing away the pulp of the fruit, transportation, roasting grinding and then the semi boiling of the seeds before it reaches your cup. White sugar might be cheap in price but it's unnatural and has many processes which are also very intensive in labor.
And then also think about carbon footprint of keeping animals in cruel tight cages and force then to eat only coffee fruits to gather coffee beans in their poo and sell for 100$ per kilo.
Aluminum moka is cheaper than machine. To pour boiling water into the cup with ground coffee is even cheaper. And we are not talking about beans itself, which are all sorts of quality.
I would have guessed you could get a coffee maker for $10 anywhere but it seems they cost $20 nowadays. Still even a $10 mocha pot would be a luxury by that definition when you can make folgers cowboy coffee and drink it out of the single pan that you use for everything.