These Pasteles de Nata are amazing, indeed.
Pasteis de Nata are one of my favorite foods of all time, but they were fairly uncommon where I grew up in an Azorean Portuguese community in California, although Queijadas are pretty similar.
What I think it's funny is how the Portuguese focused so much on working as real estate developers/contractors and basically never took the entrepreneurial spirit to any other industry. If I were in MA, I would look into getting a coffee shop that served only a good european-style espresso, pastéis de nata e ginjinha. I bet it would find a good number of customers.