Unfortunately, none of the groups studying these therapies has attempted a rigorous comparison between decompressive surgery with shark embryo or omentum transplants and surgery that simply decompresses without transplants. Of course, all treatments must be judged by the risks and benefits that they offer. Because both shark embryo and omentum transplants involve invasive surgery, the risks are not trivial. To my knowledge, the benefits have been modest and not yet convincing. There are several telltale signs of unproved therapies.
Most journals require rigorous proof of efficacy before they allow a claim to be published.
Be wary of people who ask for a lot of money for an experimental therapy. Most legitimate clinical trials will not ask for large payments for unproved therapy. Investigate the risks. Most therapies have risks. Carefully weigh the risks and benefits of the therapy.