[wingerlang]

    Shirts for hackers, developers, and blockchain-enthusiasts won't sell too well

Maybe not if you put it in a H&M store. But these kinds of shirts do exist and I don't think 'nerds' are averse to buying them.

[bensampson]

Thanks for your input, wingerlang! I completely agree, these kind of shirts do exist and there's definitely a market for them. But Wikishirts literally offers 5.7 million unique shirts, an unmatched degree of specialization that, I think, makes the shirt very personal.