How about some simple math fun.
20 minimum wage employees after workers comp, insurance, matching taxes, and several other expenses is around $600K per year. Then add another $100K for rent and utilities. Then easily another $100K start up cost for equipment. we are at a measly $800K without any inventory.
Then lets get crazy and say not including the above expenses we can make $1 profit per card selling only cheap junk. Lets also say someone is in the 1/10 of 1% of people that have all the skills needed to start and run a successful business long term.
They would only have to sell 2,192 cards per day to break even. Seems doable to me.