I am not really the average comsumer. I ship anywhere from 60-300 packages a week. I know how shipping charges work, I have to deal with them everyday. So....
1. very very very small chance of that happening. How would they lose money on combined shipping? By losing the profit that is made on overcharging the shipping perhaps
You have to admit that the way newegg calculates the shipping charges is just retarded. If they charged the proper shipping this would result in better customer satisfaction and no profit loss.
2. I understand what you are saying, and trust me I know that box size also matters. However it is not like they need a bigger box to ship to kits of ram. Even if they did I know for a fact that UPS has an automated system for the charges. Ordering $500 worth of harware that can fit in a small box should not be charged shipping for every item. For example, I placed an order about a month ago that I paid over $40 for shipping from the egg. Now how much would it cost me to send that package back them? The answer is $22.10 to be exact. That is with the same 3 day select that they used to send it to me. Now does a small company like mine get better shipping rates than newegg? I think not. This is a bit too much overcharge on neweggs part in my opinion.
3. Exactly, it is easier for them just to make profit off of the shipping as well. Why take the extra effort to charge customers correct for shipping? It CAN be setup for them to properly charge shipping, however you are correct, it is easier for them to avoid this.