I love how it turns from a reasoned argument to a petty personal attack. Keep that shit out of it.
I still don't agree with it. Most importantly, the thing that hasn't changed is big crowds attending preliminary finals. Regardless of the opponents. That's why I believe there'd be few issues cracking 30k with an out of town prelim final at Allianz or ANZ.
Aren't you advocating that all finals should be moved to Sydney, not just Prelims?
Let's look at that first. Sydney is renowned for loving a marquee event (I'm not saying it's on its own in this regard by the way). Things like the Wallabies, the Swans and whatever else is trendy in town will always do well in Sydney. Grand Finals fit that same mould - hence why two out of towners sold it out last year. There was no big event fatigue for attendees as there'd been no other game in town for ages (both prelims were held interstate).
If you held prelims both prelims in Sydney last year there would have been very poor crowds because only one Sydney team was in the final 4 (Roosters) and they are renowned for having a very small supporter base. If there was one prelim, maybe it would have had that marquee feel and would have drawn a crowd - but when you're stretching them out over two games you're diluting that small group of people and impacting both crowds.
Now let's imagine we add on two more weeks (6 more games) of finals in Sydney before this. All I can say is you'd better hope there's 6+ Sydney based teams (which isn't looking likely anytime soon).
What you're calling for would be an absolute mess. You're basing your decision off significantly out of date, and therefore useless, data.
Now let's move back to the argument for prelims only. If we have two Sydney prelims (I realise that is unlikely this year), you've got the same problem of stretching the limited market of people who are willing to fork out the dollars to attend. It makes no sense. The only possible thing I can think of is nostalgia (effectively where you're coming from), which is such a ridiculous thing to build a business case on.
(I apologise for the length of this)