Being a celebrity is mostly a way to make money. And with influencers, the "career progression" that almost every upstart vlogger/instagrammer aspires to is pretty well-defined:

1) Provide some kind of entertainment content as a vector to push other people's crap

2) Over time, build up your user base and revenue base, until you become a well-known brand in a given market segment

3) Transition to pushing your own crap, e.g. a line of products with your name on it

Of course, selection is very strong there. Most would-be influencers spend years and fail at step 1. Few achieve step 3. And it can't really be any different, because attention economy is the ultimate zero-sum game: people have only so much hours in the day.