Why do dog owners prefer to avoid calling a vet when dog is in danger?

Instead they go on here and ask questions "Is my dog dying?" Or "My dog is peeing blood, does it have cancer?" It takes less time to call a vet and ask and in return get real expert advice or input. If a dog is in a life threatning condition why do they just sit at the computer waiting for answers that will just tell them to go to the vet anyway? Are they just trying to avoid vet bills and waiting for someone to say they don't need to go?