All good points if what you say is true. The thought of jumping the queue based on status would be disheartening. I refrain from really throwing an opinion out because I don't know how the list works and whatnot.
I know it's on everyone's mind but I do wonder if this was a disease brought on by his lifestyle, we all know the hearsay. Either way I hope he pulls through.
There are separate lists for cadaveric and living organ donation. Organs are matched based on pretty complex algorithms that take a whole bunch of data into account (like tissue typing, antibodies, time on the list, etc), and if the lists are all anonymous and run by national registries. They know that the whole system is based on integrity, and that people would be reluctant to donate if organs weren't allocated on the basis on need. There's no way that he could buy his way up to the top of one of these lists.
Melnyk is looking for a living donor, which most commonly occurs when people donate to specific relatives or friends. It's a separate process from being matched on an anonymous list. He's looking for a directed donation and he has a rare blood type, so it most likely wouldn't take an organ away from someone else (there aren't a lot of people who randomly offer up an organ for "any random person who happens to be on the list" in the absence of a public plea or a chain of transplants).
Organ transplantation isn't a cure but more like trading in of one problems (the disease that's going to kill you) for another (risk of organ rejection, side-effects of anti-rejection medications including weaker immune system and increased risk of cancer, graft vs host disease, etc.) Patients have to follow a strict regimen of medications and testing afterwards to try to limit rejection. Doctors won't list a patient for transplant if they don't think that he/she will comply with post-transplant treatment - they're not going to waste a scarce organ on someone when there are others who would take good care of it. In Ontario a patient must abstain from alcohol for at least 6 months in order to be eligible for a liver transplant.
http://www.cbc.ca/news/canada/toronto/liver-transplant-ethics-should-alcoholics-be-sober-first-1.2934786
We don't know if his lifestyle contributed to his health problems or if it's something completely outside of his control. Since its a voluntary system people don't have to donate.