Well yea. It’s all about the money. Other leagues do this also with different jerseys and such. The city connects must have generated more revenue and so they will come up with another version.
I know the EPL clubs do it because of the shirt/jersey collecting and trading culture in Europe, and elsewhere. Does the US have a similar shirt collecting culture - it doesn't appear to, from distance? It's surprizing how things can go - I have shirts which I bought because I liked the design but which, over time, have now become collectables - and, ironically, almost too valuable to risk damaging by wearing. There are many, over here, who buy shirts just as collectable potential investments, never to be worn - in collecting circles 'BNWT' ('Brand New With Tags') is the ultimate, outside of the rarified air of game worn shirts.