You're absolutely right, there's nothing wrong with me buying out a bunch of tickets to the big game and then selling them for profit once the box office sells out, right? It's an honest buck. Oh wait, that's illegal. "Scalping," or merchanting tickets, is considered dirty and is illegal because the scalper is making a large profit for doing absolutely nothing.
Houses involve actual risk and upkeep. A better comparison would be buying a colored Gacha weapon, proffing it to 100, and then selling it. You invest money in the house/weapon, take care of it for a while, then after it develops you reap in the profits. You risk the house being a dud, the housing market not rising, the colored weapon falling below egoable, or enchants destroying that nice 18dur smithed Broadsword. Unlike merchanting/scalping, you don't just sit on your arse doing nothing.
In addition, ever read the label "Not for resale"?
This all the way.
Merchants are kind of like double scammers. They scam the good will of people offering low prices to help out their buyers, and they scam the buyers by making them pay more than they should for what they want, generally well above market value.
A living isn't "honest" if you don't contribute in anyway to the community. All merchants/ scammers/ scalpers do is take from it.
On the other hand, I honestly do dislike people making money too easily when they don't deserve it.
I do accept merchanting in forms of:
1. Person A doesn't have a proper way to sell so person B buys and sells for higher in his Shop/House.
2. Person A has a set price (not haggled) below market value. Person B buys and sells at market value.
Anything beyond that is pretty much driven by greed and taking advantage of people.
Scalping in reality is illegal, but makes money regardless.
In a game, the same method of scalping is completely legal and still makes money.
Seeing how we're talking about a game, bringing up real-life scalping is useless.
Additionally, your talk about how real estate in reality is like proficiency is all good, but consider it's entirely possible to make your money by hoping the housing market goes up.
It might not happen, but if it does, it required little to no effort to gain this money.
If you want, you can fix up the house for more value, which is the same as proficiency on an item, but it's not needed.
The market can easily make it worth more just through inflation & deflation.