In America, salads are much more difficult to find — let alone
good ones. They're also priced accordingly, thanks to the magic of supply and demand.
So, even after an epic lunchtime quest of hunting/gathering, you might end up out 20-30 bucks for a depressing pile of iceberg lettuce, croutons, and shredded cheese. (In America, this is often called a "Caesar salad." Yes, really.)
Even if you do happen to be in the rare neighborhood that has a good salad connection, you're still committing to spending your lunch break furiously chewing raw vegetables in whatever few minutes you have left after running to go get your meal. This is what I did every day for months when I worked in an office, but let's not pretend it's ideal.
The dream would be fresh, cooked vegetables, so that one could get the best bioavailability. [1] But that is largely a fever dream, even in major cities. For example, I can count on 1 hand the number of restaurants I know where I could order a simple plate of steamed/roasted broccoli for less than 20 dollars.
[1]: https://www.sciencedirect.com/science/article/pii/S1878450X1...