Firstly I would like to say a thank you for all the info I picked up here when starting this earlier in the year. Learned a lot met some great people, spent way too much money, but it made me very happy. My wife had 7 weeks in France and the UK, I bought some Infantino and Porter Flash and could not be happier. Different strokes.
At the start I followed the dealers and ebay and realised after a short while that the Infantino stuff seldom came up.
Moy had a page for $500 with Flash at speed but no Rogues, I should have bought it but passed and it sold on Heritage for maybe mid $700s including buyers fee.
A page from 300 showing Barry at speed, but no Flash or Rogue went for I think $580 on ebay in Feb.
I then went to Cool Lines in late Feb about a couple of pages and was sent a full list of Flash Bronze Infantino.
I picked two pages that really did it for me, including a Rev Flash / Mirror Master page and started haggling. In the end was happy.
Steve replied to emails promptly and shipped it quickly and efficiently.
As the year has turned out, looking over Heritage and Comic Link I think I may have gone maybe 10% but not 15% over, maybe less.
Sure there have been cheaper pages sold this year, and I got some of them, but every time the content, context picked up the price jumps.
Know your stuff, check the archives, and roll the dice. You may get a similar page for less, if you just wait, but for certain stuff, it is getting harder and harder to find.
My perspective may also differ. If I go to SDCC it will cost me around US$1,800 in Airfares alone before paying the crazy accommodation.
Also just like these posts, the more research the better you will be.