Velli,
I understand the thrust of your argument. However, I have read of cases where people couldn't afford to file immigration paperwork because they couldn't afford the fees. A recent example is of this Australian guy in Key West, for 6 yrs, he and wife couldn't afford to file the paperwork because the wife is in the military and pay sucks big time.

He couldn't work, or worked for small pay, just to keep his family afloat...
Moreover, there are lot of people who come from poor developing countries, even developed countries who can't afford to pay the fees. So, hiking the fees isn't going to be a welcomed idea for most of these immigrations.

I have no problem paying the fee, because I have solid financial status, but I have to always think of people who aren't fortunate enough to have money in excess.

Paradise has its own price, but the price has to be right too.
Most recently, while shopping at Macys, I had an opportunity to talk to a newly minted immigrant from Ethopia, a Sales Associates. He won the diversity lottery, and he told me that the fees they have to pay to be able to obtain their greencard is enough to ruin one's family, leave them destitute and unable to even afford a plane ticket to the US. So, their strategy when they win this lottery is simple, the village or family pull together resources, with the hope that once a family member is in the US, he or she will pay back those at home in Ethopia.

So, can you imagine how many winners of Diversity Lottery never make it to the US because of lack of finances? So, this challenge is now being brought to the US by this ridiculous hike.
USCIS can hike the fees, as long as it improves its services and cut processign times in half, so that everyone wins. Why not institute premuim processing for families?