It adds enough of a barrier to be worth it. In the way I have implemented it, you can only have one account per ID (for example passport). Yes, you can buy fake passports, but it's prohibitively expensive. Read my blog post for more info.
I mean, reddit accounts are valued based on the identity they have built. Its not farfetched to imagine uninterested users making and selling a single account each.
This is not a technical issue - it's a societal one. Do we want online ID verification? Are the trade-offs worth it? Do we want to make the internet a place that requires an ID everywhere for age verification or to prove that you're human? What would the implications be?
Regarding your implementation: Most people don't have a passport, so it's a non-starter - but again, this topic is not a technical issue.