What tripped me up with real estate agents is how socially skillful they are. It's a survival skill, so as a cohort they're all anomalously good at building rapport and, from there, trust. If you don't know what you're doing, and what they're doing, and you rely on them as the domain experts, there's a pretty decent chance you're not going to be happy with the outcome. Their incentives aren't perfectly aligned with yours, and if you're not providing a structure to engagement, they are, and that structure will serve them.
But the flip side of this is that what feels like mercenary behavior is also useful for the actual job of making real estate transactions happen, so if you optimize for the most trustworthy, least self-interested real estate agents, you're also not going to get the best outcome (and you're going to bounce off of lots of non-altruistic real estate agents in the process). It's going to leave you with grim feelings about the entire business about real estate. Which: fair enough! There's lots not to like about it. But you, personally, as a consumer of real estate services, will feel better and have a better experience if you learn to understand and adapt to how real estate actually works.
And a lot of mercenary real estate agents are perfectly lovely people, just doing what it takes to do a job well.
As with real estate, so with investing, I suspect. Great example: every VC you meet is going to tell you they're interested in investing and that they want to move the process forward, and they'll keep giving you hoops to jump through as long as you let them without ever intending to invest. That's incredibly aggravating, until you know what's going on and learn to read the room.
I'm not good at any of this stuff and would get gutted like a fish trying to raise a round myself, but I've had the benefit of seeing it done well firsthand now, and talking to others who've done it well, and it makes a lot more sense to me now.