Just backing this out, $400 at 2 hours of actual fitting, 20 minutes of answering questions to random people for every actual fit, two 20 minute follow up conversations per fit. Aim really high and go for 50% utilization of time and say the shop take is 50% (I just made that number up). Your real $/hour in that scenario is $400/6 hours = $33.33/hour. At 40 hours/week you make $69k/year. Back in 2018 the cutoff for an individual to qualify for low income housing was just over $82k. Cutoff for a family was a bit over $117k.
Yes, it is a bit cheaper outside the city and yes, there are a lot of people who have lower rent due to the local rent control laws if they haven’t moved in a while, you could have several housemates, etc., but it isn’t a short path to riches even once you get the skills to command that price.