$2,000 a week is comfortable living to be sure. But her father, who has no known talent other than grifting his kid, took in $16,000/month. Then she had to pay the lawyers. Britney is the one with talent. It’s financially boggling.
Substance abuse is a very complicated issue. Habits can range from infrequent, to regular, to addiction, to an addiction that consumes your entire life. It appears Spears used drugs during her life (so many celebrities and entertainers and frankly, Americans, do), but I’m not sure how often or what they were. Given all the other abuse, I have zero trust in the conservatorship to tell the truth on that point.
Most don’t pay for occasional drug use this way. Rehab and therapy are warranted in more severe situations. Something like total life control almost always isn’t.