Heh - problem with adventures is that they are generally used for playing.
I used to like to buy D&D lots. I mean, it's fun - and I got so much useless crap in there, but sometimes I got out some hidden gems (like a mint first print
DM screen).
But 99,9% of the times, it is crap, ok.
Once I received one, and digging inside I found out what looked like a near mint first print
G3...
... only to find out on opening it that it had been scribbled all over with different kinds of highlighters (yellow, azure and red) plus black ink and pencil.
And the owner, just to be sure, also put in his name (so nobody would steal his stuff).
I cringed. Lots.