The organizer himself should determine what the price or suggested donation for his products or services should be. Find out what amounts are realistic and commonplace from the competition or other people who work in similar fields. Pricing also greatly depends on the training format. For example, admission to a large-scale event with several hundred participants might run from 3 to 10% the average local monthly income, while one-on-one lessons (especially for an entire course) might cost anywhere from one-third to one-hundred times the average monthly salary. The affluent might pay whatever amount asked for your opening the door to life in two worlds, which is indeed what the practice of out-of-body experience is. You can come to a separate agreement with each VIP client.
Since pricing falls squarely on the business side of things, you need to approach it like you’re running a business. For example, you might offer a discount to people who do group-buys of tickets, as well as use other well-known pricing and event-promotion incentives.
Considering the nature and uniqueness of the methods on offer and the fact that this is indeed to the only attainable "superpower", the organizer should feel free to play with the pricing until he finds the ideal solution. The price or suggested donation should be sufficiently elastic. For example, sometimes doubling the price doesn’t cut attendance in half, but instead has a negligible impact on turnout.
Perhaps paradoxically, advertising low prices does not necessarily lead to people being more willing to buy tickets to seminars. Low prices might put them on guard, especially if similar kinds of training sessions in other fields cost substantially more. There is also the paradox of perceived value, which means that high prices often don’t put people off, but attract them instead. Explanations for this phenomenon include people attributing increased importance to the event due to the increased expense, thinking, "It’s expensive – that means it must work and that everybody needs it. I am going to carefully follow all the instructions."
Meanwhile, don’t forget that you’re putting your own money at risk when fiddling with the pricing: you’ll still have to pay for the auditorium, advertising, and the work of the instructor if you’re only performing the role of the organizer.