Collecting anything is in the 'eye of the beholder' whether it is pins, patches, HLs, books, postcards,etc.
If your looking for value, it becomes what the buyer is willing to pay when offered.
I know pins were traded at the last Reunion. Many climbable lighthouses offer pins and are usually in very low supply (my experience) if you collect them.
I find them a nice way to remember an experience or provide a companion to your HL (4 of 5 of the new set, and 9 of 15 of all.)
[These pins offered here will only be produced in sets of 150. Therefore only 149 other people will possess this unique set, if you have one. Many of the lighthouse pins(probably 11 of 15) are the only way to get one for that lighthouse.]