Here in the US, sellers at garage sales (and Craig's List) seem to have one of the following two mindsets about 35mm SLR cameras: They think they are completely worthless because they use film (which is dead), or they think they are worth the exact same amount of money that they originally paid for them 10-20 years ago.

Luckily, most people fall under the first category.

I love when Craig's List or online auction listings say things like "Canon Rebel G with 35-80mm zoom lens - I paid $900.00 for it new three years ago!"