I bought a VIP pass and got into the con 45 minutes early at 9:15AM on Saturday. I stayed until 3PM that day and only took 1 break to sit down in the lobby where it was cooler. It was getting hot in the convention hall as the place filled up. I spent all my time with the vendors. By the time I made it over to the arcade section, there was someone on pretty much every cab and I didn't feel like waiting in line.
I didn't eat lunch because the food there was so pricey and the line was long. It was movie theater concession expensive. A fountain drink was $6! By 3PM, I was starting to wilt and need to get some food and drink.
I came back on Sunday and we were all let in at 10AM. Sadly VIPs didn't get early entry on Sunday. I did another pass on all the vendor tables which took about 2 hours. I want to say only 4 or 5 of the games that I got were on Sunday but vendors were willing to discount more. Silent Hill Downpour for example was priced at $58 and the vendor let me have it for $50 without even haggling.