Hi Daman, In Australia, the cost for each tablet comes to $6.5(from PBS site, though I have bought it at 3.5 at Priceline chemist) . meaning $9000+ per year just for Mezavant. Biological drug infliximab will cost $500+ per vial which is another $3500. The total cost of medication alone is $12500, other costs include specialist visits and yearly colonoscopy which would push it close to $20000.
As per DIAC site, $8000 is the max limit, so, unfortunately, it will be very hard to get PR.
It is, unfortunately, a very biased system, it doesn't take into account the work potential of the person. My wife and I pay close to $40,000 in tax(on 457 Visa), yet I am in this predicament whether to apply for 189 Visa or not, despite having an EOI. I am on 2 tabs of Mezavant and 3 tabs of Imuran per day.