It’s not. Envato’s traffic is decreasing month after month. Charging for support (with a 30% cut for nothing) is all they have left to cover up for the probable losses in sales. The (bad) implementation of the responsive design is also a way to get a better position in Google search results. Wondering what will be left of this website in a few years.
I may be wrong but it seems you are only adressing paid updates in your answer, not annual license renewal.
This month, sales have been OK for ten-fifteen days or so, and now it’s plunging again.
Just be smart and decide to opt out of this system, it will save you the trouble of:
1 star rating, buyer blackmailing, buyer disputes, working extra hours for a few bucks (especially if your item is sold for a cheap price), having no visibility on the scope of the “support” requests you are going to receive.
This will just create more problems: you will lose your time for almost no return on the investment. Envato will always be on the side of the buyer, never forget that.
The disadvantages largely outweigh the benefits of a few bucks, that is certain.