One reason is because last time from Bestmengqin's blog

I'm convinced that it's their best mode due to NBA2king its creativity, and the fact that spending VC will not do anything. You are able to be as creative as you'd like, without the pressure of spending money. 

You can transfer teams, build expansion teams, download floor designs and uniforms from other players (I'm thinking of those of you SuperSonic fans) you can also create super teams, blow up teams, or import draft classes or the draft class of the past. Basically you can do almost everything you want to which is the reason it's so addictive.

Despite how awesome the mode is, it hasn't received much interest over the last couple of years. 2K states that this is their most successful game, however, If MyLeague does not improve I find it hard to believe the claim. 

This game could be their most successful, according to me. One reason is because last time we had a new generation jump, the quality of NBA 2K improved vastly from appearance, game modes, to play.

The release of 2K16, 17 and 18 a short time after the release. I believe these to be their best games with 16, which is the most memorable. If they can replicate that sensational magic of NBA 2K21, not only will they create an incredible game, but the effect of it could be so much larger due to Buy 2K MT Xbox the boredom that COVID-19 created for us all.