I can understand if you think it may be going too far, but some people like to collect everything they can from certain casinos. Personally, it would be a little too much for me but I still love to see the different items that were available at that time. Since I am not old enough to have a memory of going to Vegas in the 50-70's, these kind of items help give me more of a visual reference of what it may have been like. Plus, I really love the graphics and fonts of the time and think it is kind of cool to see how they would advertise at that time.
The other benefit is that these items are usually listed under the tab 'other' and make it easier to skip over if all you are interested in are the chips.