There is certainly a high level of jerkiness in making fake reservations, but I think it's overblown in the article. If a restaurant is exclusive and popular enough to require reservations, and people are willing to pay $5-10 for a reservation, why don't they just charge $5-10 for reservations themselves, or require a small membership fee to make reservations, or start rejecting customers who can't prove they are the…
Furthermore, an ID check isn't as painless and easy to implement as you say. Often, other guests arrive before the person who made the reservation. Public figures make reservations under assumed names. And the name on someone's ID may not match the name they typically use (read patio11's brilliant piece http://www.kalzumeus.com/2010/06/17/falsehoods-programmers-b...).
And then there's just the offensiveness of requiring people to carry ID in the first place.