Being a hunter is generally a thankless job.
Even when the truth is staring them right in the face, most people still don't understand or believe what's happening to them could be caused by the supernatural. Instead, more often than not, they place the blame on the more obvious targets; namely Dean and himself.
So they got in a brawl in Memphis for curing a bar of a poltergeist, threatened with a shotgun when they were chasing a black dog in Ohio, and got arrested for kidnapping when distraught parents in Indiana didn't buy that 'the sidhe did it.'
Hell, last month he had saved a pregnant woman from an Aswang, and she maced him in the face.
In the end it's just one more town they can't show their faces in. Half the time he feels like Frankenstein's monster, chased away by torches and pitchforks. Of course, they don't do it for the thanks. They do it to help people, and maybe because they can't stop. Saving people, hunting things; it's practically the family motto. That doesn't mean he has to like it when he's covered in sweat and dead man's blood and the girl you just saved's husband shows his appreciation with a punch to the face.
Sure sometimes people were grateful. They might get a tearful hug, or a homemade meal, or even a one-night stand. Well, that was more Dean; Sam couldn't quite bring himself to accept those sorts of thank-yous, not since he left Stanford.
But every once in a while, they were cut a break, and they got something perfect. And this, this was almost better than sex. Sam relaxed, his long limbs drifting serenely in the hot water. The jets against his back hit just the right spots to relieve muscles aching from digging graves and hotel mattresses, and he let his head fall back, enjoying the sensation.
"Dude, hurry up!" Sam barely even twitched as Dean shouted up at him from the first floor of the cabin where he was lounging in a sinfully soft easy chair. "It's my turn to use the Jacuzzi!"
He ducked his head under the water, ignoring him.
Maybe they just needed to rescue more people with time shares.