I think sometimes sets add value and sometimes not so much.
I've seen complete Gazetteer runs sell for $1000, and I want to say I remember a complete
DL set about the same. At the time I thought those were a bit of a premium - someone paying full price for a ready-made collection.
Idk about a run in shrink - summing them would be what, average @ $300 close to $5k? That seems like a lot for someone to pay for a set, like imagine a buyer who has no
DL shrink and wants them all. I suppose it could happen.
Probably the better bet is to sell them one-off. And cry a little because they belong together. Don't know if I could do it

I draw the line at collecting... D&D beach towels.
Shoulda been: ".. from Pangreenia to Floratopolis, from mystical Treeonia of spectral Forests to Schruborial dimensions." - The Forests of Leng