We have open market vendors as well, but most people tend to buy in the grocery stores because they think it's cleaner but most don't bother asking questions or educating themselves when it comes to farming practices of the larger companies.
The European market is completely different. I think their standards are higher, but that's just a guess.
I just like to buy fruit/veggies in 10lbs or larger cases because once I'm out of chilled produce I tend to eat the junky processed snacks like everyone else when I'm slightly hungry.
Before I buy a case of something, I check the produce out first.