In dollars, no where near what you may think they are...
As to the nostalgic value, immeasurable.
When reentering 0 scale in the last third of my life I purchased each and every P/W Lionel item I had as a child only in the later scale sized 2 rail version.
Then the "fever" peaked which prompted the addition of three 3 rail add-on train runs on different levels on my 2 rail layout to complete the full circle.
Only wish my father could see what he started.