Jaguar Paw: What you're missing with your examples is that a concert is a unique, one-of-a-kind experience that will never happen again (at least not in the same way). If you miss it or are prevented from going by scalpers, you missed it forever. It's not fungible like gold or money or stock shares. House flipping seems unrelated - houses are virtually all priced at what the market will bear, and it's extremely uncommon for someone to buy a house and immediately resell it at a huge profit without doing work on it to make it more valuable.
Price gouging is on a spectrum. Gouging on things like water and gasoline are horrible. Food? Well, that's bad, but I mean, people don't NEED chocolate and frozen pizzas, so maybe gouging on THIS food isn't AS bad... (devil's advocate). Gouging on certain consumer goods like the year's hottest Christmas toys etc. is fairly shitty because you are basically fucking over kids from poorer families. Gouging on things like concert tickets and sporting events is shitty because you are preventing people from experiencing a one-of-a-kind event that they care about a lot. Gouging on luxury goods and collectibles is I think the least offensive - they're not unique, no one needs them, people will have the chance to get another one later when the hype dies down, etc.
I have a hard time believing that you really don't understand how ticket scalping makes people's lives worse. But sure. Let's go for it.
1. People who would otherwise get face value tickets had to either not go to the show, or spend more of their hard-earned money. Negative impact, either way.
2. Everyone has to deal with all kinds of anti-scalping measures when buying tickets and attending concerts, which is a hassle. In my personal experience, this has included: very long lines to get in (because everyone has to have ID checked), waiting in very long lines to buy tickets (because the artist/venue believed it was the only way to prevent scalping), having to make plans further in advance, having to do those stupid CAPTCHA things, being unable to sell some tickets when you can't make it to a show because of illness or emergency, having to be late for a show because you couldn't pass out tickets to friends ahead of time and one friend got stuck in traffic... that's just off the top of my head.
3. Buying from secondhand ticket sites or eBay hugely increases the odds of you getting scammed (this has happened to me)
4. Going to see a band you care about a lot, only to sit next to a bunch of noisy drunken assholes who didn't care about the music, but they have a buttload of money so they just bought whatever ticket was "hot" on Stubhub that weekend to impress their date. In the old days, the front rows were the biggest fans and it was really fun for the band and the fans. Now it is like half biggest fans and half richest assholes.