For example, with night sight, I actually took a bunch of pictures during Halloween, whereas otherwise I wouldn't even have tried. With call screening, I actually get to check all those scam calls I get every day. Wireless charging is also a pretty nice feature to have.
Things like that are much more impactful in my everyday use of a phone than having a 5% faster CPU.
I am only seeing them ~$800 (not plus or note which are obviously even higher), e.g. from AT&T [0] and Verizon [1]. That's quite the difference from $500, can you link where you are seeing this or do you mean second hand or when you switch carriers or something?
0 - https://www.att.com/cellphones/samsung/galaxy-s9.html#sku=sk...
1 - https://www.verizonwireless.com/smartphones/samsung-galaxy-s...
$600 looks to be the most reasonable price for a sealed new unlocked Galaxy S9 [in the US]. The lower priced 'new' copies on Swappa look open-box, which are likely not new, but a refurb/return, or someone selling their used device as new. Most of the new copies on Swappa are apparently open-box units, as are most of the new units on Ebay. Definitely hard pass there.
Best Buy has new copies for $700 - that'd probably be the... best buy. Maybe you can find a like-new refurb for $500, but it seems like a sealed actual new copy will be harder to find for that price.
So like $150-250 saved by choosing Samsung, and probably getting a superior package in most ways. Google has reduced the warranty period in the US of the newest waves of Pixels by 1 year, so really they aren't offering a ton of value for that high price.
The NA model is still $720.
At the same time - yes, B&H gives it their own warranty.
In this example, a Galaxy S9 is 8 months old. It retailed for $720 8 months ago. Now it sells for $520.
The Pixel 3 (with the same SoC) sells for $800. So it's not just $80 more. It's really like $280 more.
If there's one high end CPU from your favorite CPU manufacturer that comes out each year, guess what?
I guess it seems $280 more expensive for the same SoC, but consider that Pixel has plenty of custom silicon in it to justify a higher price (than simply the SoC). The camera literally relies on it.
Also, it's crazy to me that Apple has such a huge lead in single threaded CPU performance. They've been ahead for years, and no one seems to be catching up.