MJ’s commercial success was helped a lot by the vast amount of money that was invested on him by the record company’s marketing policy (very expensive music videos, mandatory giant world tours, extensive TV/radio promos, etc).
Pepsi (from the Victory Tour era up to 1993) also greatly contributed to his commercial success because he became synonymous to a drink brand name known to everyone.
Compare his commercial success/sales between two periods: before late 90s & after late 90s.
Before late 90s, MJ was taking the lion’s share of the record company’s marketing funds (at the expense of the company’s less known artists) which led to his bigger success/sales, as compared to the period after late 90s when the record company shifted its focus & decreased dramatically the amount of money invested on him which in turn had a very bad effect on his success/sales.
‘Invincible’ was comparatively a commercial flop for him because there was practically no promotion by the record company.
Even if he released independently any other studio albums in 00s, they all would have flopped too without a major record company that would support them.