How much does a fast pass cost in actual dollars? It sounds similar to the early access rewards that many independent creators, me included, offer on our patreons. The difference being a monthly payment rather than one each update.
I previously offered an early access of 60 pages for $5 a month on my patreon, now that the main comic has changed I am aiming for 200 pages early access for $5 a month. For comparison's sake, a page is approximately 5-7 panels so let's say 8 pages = a 40 panel episode. This means at my previous offer, which sold just fine with very few complaints (the complaints I had were usually from people who didn't read instructions, couldn't navigate patreon, and ignored my private messages offering to help them. So it had nothing to do with the price or product itself) I was offering 1 episode's worth in early access for $0.67, if you do the math.
Let's also bear in mind that most people who offer early access do not offer this much and prices will vary. I'd say my services are relatively cheap. Each and every creator (and their respective contracted partners) is entitled to setting their own prices on their content, as they are the owners and creators of the content itself. Their comics, their rules.
I just think it would be more fair to create a relative comparison to other established salesforms in the business, since this is a new thing for webtoon. It's entirely unfair to compare this new service on webtoon to the previous state where all of their professionally produced content was available for free, as that is an unmaintainable utopia for the readers and absolute hell for the company and its creators in the long run.