I'm not sure his mother can support him financially. Panther posted a link to an article that included some info about the family finances. Quote from the article:
"The Van der Sloot family's finances were already depleted hiring lawyers to defend him in the Holloway case. Now his mother Anita, an art teacher at Aruba's international school, must pay for defense counsel in Peru."
Paulus was the main breadwinner (unless she came from wealth) and it was his job that allowed them to live the lifestyle they had. It seems Joran was cut off financially after his father passed. She has two other sons to take care of and I have no idea if Paulus had a life insurance policy. If he didn't and she has to survive on a teacher's salary, Joran will get little help from her financially.
As for living like a king--never. I read he doesn't have a toilet in his cell. He has a bucket. Don't know how often he gets to empty it or if someone does it for him. Plus, he is probably terrified every waking moment knowing he is next to to a Colombian hit man for hire.
IMO