I never feel like throwing the towel because I have money and i earn money. Enough money to the point that I can recover from my past mistakes. That and the fact that I actually learned from my mistakes and I know my limits on what livestock my system could support. It also helps to have a few lfs who actually know what they are doing with sps and you know better to stir away from the bad stores who are only in for the buck.
The only thing I noticed bad in this "hobby" is that some people do not have their life priorities straightened out. Those are the people who should throw in the towel for the meantime. I've been to other forums where there are students trying to run a reef in a dorm or an apartment. I remember when I was a college student barely have enough money to buy food for dinner. I had many days with nothing but bean burrito from taco bell and ramen to say the least. Those students should be studying, not staring at an aquarium all day. You can do that when you have a real job and need to relax after the job. Plus, you are moving after 4 years so I feel bad for the livestock you purchased knowing nothing in your current life is stable.
If you look at the big picture, those with killer systems have stable income. Good enough to support their life and their aquarium. This is no disrespect to the reefkeeper skill, whether you are wealthy or not. My only point that I would like to make is that if you can't support the hobby then don't do it in the first place or throw in the towel while it's early. Every reefer I know has had problems with their reef. It is those that can recover from their disaster that end up with the hobby for long.