Best answer
Not very many cut-throat marketers in this thread...lol
There are really just 2 kinds of marketers: Those who want to build up a legit brand over time, and those who will do whatever black hat method that is needed to succeed quickly, in the short run.
The first group will slowly build a following and gain real fans over time, but it can take YEARS. The 2nd group will just buy an aged account that already has fans and squeeze every drop of marketing out of it and then move on. Sure, they aren't real fans, but some will buy stuff and money will be made.
There is a use for buying aged accounts, as well as for building your own from scratch. Which path you take would depend on the kind of marketer you are. Yes, Facebook will eventually close the bought account, but anyone buying it is not looking for long term use anyway...they just want to market the crap out of it for the short term.
Ironically for me, my legit account got blocked and my fake account is still going after 6 years, so I use that one to promote stuff. It's the typical fake with the pretty girl picture that isn't real, like a lot of people use on forums, including ones I see here.
I also used to sell aged Youtube accounts too. Great for monetization and some with 20k or more followers go for as much as $1000+ on the influencer marketplaces. Saves the years you might normally take to build that kind of following.
Buying aged accounts isn't for everyone, but it does have the specific purpose of saving time. It always comes down to time or money, right?