He doesn't mention how many hours he spent marketing it. I suspect not that many. I fully sympathize with his struggle, but this is a trap most programmers fall into so easily. Market need/fit > Marketing > Design > Programming when it comes to software products. You can't just build it and expect that they will come, unfortunately.
It's hard to context switch between marketing and programming. You can spent many hours marketing with little return, especially without a product. Programming by itself is slow, but there is a definitely return in terms of progress. So many people choose programming first before marketing. But I get what you mean. Its though.
I mean, in terms of chances in the industry - I got in by completing a 4 year CS degree. If he gets in by spending 3 years building his own game then I'd say it was worth it.