The hobby of collecting Autographs is called philography.
A philographist collects autographs
You can sell autographed albums to record collectors. You can also sell them to fans of the person who autographed them. Another person who would be interested is one who collects autographs.
There does not appear to be a name for it.
Quodophile.
Phonographer.
Weird
Some of the names given for a person who collects trains:model train collectormodel train enthusiasttrain modeler
Someone who collects everything would be called a hoarder - this type of person may have OCD as well.
That's an entomologist.
Gun-collector
usher
The person who studing about the shell is calles as chonchologist.