They still had to pay at least the basis charge, which was 30 or 60k per head depending on how long they were here for. That alone should have more than covered the cost of providing civic services to them.
If they come and live in 10M house it's 300k/year right there if you tax properties/land (you can use progressive rate so it's higher on most valuable properties). Add consumption taxes and every rich Chinese/Arab kid is sponsoring welfare for few dozens people per year.
