In an interview with 4gamer (translated by Automaton via VGC) Like A Dragon Infinite Wealth director Masayoshi Yokoyama talks about how surprised they've been at the instant success and sales of the game.
"We gave a press release about how [Infinite Wealth] sold over one million copies worldwide in one week following its release, but it's really a speed we have never experienced before"
In a world where games are having a tough time selling and turning profits outside of the major releases hearing a success story like Infinite Wealth's is certainly a breath of fresh air in the industry. Yokoyama would go on to say that while their games typically do well, it's a slow burn rather than a sprint out the gate.

"Like a Dragon games sell in the long run, rather than right off the bat. This has been the case ever since the series' early days. It has an adult player base, after all, so there's no rush, you know?
"People hear about the games from their friends, they happen to come across them, and that's how the titles grow. That's why the way [Infinite Wealth] started off was quite surprising to me."

Like A Dragon was my entry point in the series (I know I know I shoulda started elsewhere), but despite not having a connection to the franchise like others may have I have thoroughly enjoyed my time with the game through the first 8 chapters that I played. If the industry ever slows down releasing games everyday I'll definitely be going back to finishing it and am happy to see its success.