Are there some things that are rather worthless, yet you have a hard time throwing them away?

For me it’s empty coffee cans. Especially the plastic ones. They just seem like they could come in so handy sometime in the next 30 years. And they really can be, on occasion but…I have about 40 of them! And I just added one more to my collection.

Does anyone else have a “problem” like this?

(Could I sell them on ebay, you think?)