Those are all fine objections. On the other hand, these events have had a fantastic turnout, and this is particularly surprising when people have to register in advance to be assigned IDs.
My local game shop often sells out of Netrunner products. I've asked who is buying them, because our regular play group nowhere near covers this amount of sales! It seems there are a huge amount of players who play with a friend or two, have all the card pool, but can't make/don't want to attend regular events, or attend competitive tournaments. But a day of Netrunner focused on the more, er, underwhelming parts of the card pool might well be serving to draw then out (and perhaps bring them to other events, too). It certainly attracts many players I play with on a weekly basis who have no interest in the more competitive tournaments, but are quite happy to attend something like this.
I don't think it should be a super common thing, but I can't deny the popularity it seems to have.
Maybe it's worth challenging this, too. I think a lot of players quite like the restriction. One of the very oldest tricks for aiding creativity is an artificial restriction - can I write a poem without the letter 'e'? Can I write this tune without any tonal centre? Can I paint an emotive scene using nothing but shades of purple? A lot of Netrunner players are as creative as they are competitive, and this format has room for both.
There's also the fact people quite like a lot of the more uncompetitive parts of the card pool, and everyone views this as a chance to wheel them out in an environment where they won't just get utterly stomped on by Fastro NEH and PPVP Kate.