Well, we've travelled in our RV to 49 states (waiting for the bridge to Hawaii), but some states have a lot more to see than others. Palm Springs and San Francisco, or New York City and the Finger Lakes, etc. are places in the same states, but visiting one or the other doesn't really give you a good picture of what the state has to offer.
We've met folks with goals like seeing a game in every major league baseball park, or every NASCAR Sprint Cup race, or every National Park, etc. I think those are more rewarding goals than visiting every state.
You can park at the Four Corners National Monument and stand in four states at once - but what does that really mean in terms of accomplishment or fulfillment?
On second thought, if you were able to get a traffic ticket in every state, that might make a conversation starter if you posted them in your family room :)