Price of rent is a function of housing supply and demand. Rent control just pushes the costs to less visible things like security deposit, maintenance, etc.
I don't think "reselling rings" are that easy to crack down on, they probably are not rings at all rely on apps and services and operate on a more individual basis. The very framing of such is just used to justify greater police budgets, but this is something far harder than even the drug war to win. The only way to win it is to make sure entrepreneurial sorts find it more profitable to do things legitimately than it is to plunder goods, and ensure jobs and job training are more accessible than a life of crime.
I don't ever remember thinking of drug dealers at any school I went to as "ambitious". Some drug _users_, yes, but they never stole stuff to fund their drug habit. It was more like recreational, responsible alcohol for them. And now that we all have careers it's pretty clear who was actually ambitious and who wasted their parents' money.