Finding clad is EASY. There is ZERO challenge in it. Anybody can do it.
Finding silver and other old coins actually takes skill and talent. Sometimes it is talent in using your machine, sometimes it is talent in researching and obtaining permission to sites to detect.
I personally enjoy the challenge of it. I could care less about the value. Why get excited about an 1964 quarter and not an 1968 quarter? Well an 1968 quarter is still in circulation. An 1964 quarter is not (unless somebody cashes in their coin collection).
Every day, there is less and less silver in the ground to be found. So every day, the challenge becomes greater.
The argument could be made greater by people who get excited about finding wheat pennies. Since basically, they are worth about a penny in their current condition.