I need a collectors opinion

Idk how to start this off (or if i used the right flair) but I'm a collector, and i have about 10-ish Dracualaura g3 dolls. and i was talking with my mom, and i was like "if i get a shelf i'm gonna open all them" and my mom said "don't open them, they are gonna lose their value" i said " well im not gonna sell them so what's the point of not opening them?" Then she said "well look at 1950's barbies brand new vs opened ones" idk im more conflicted than i was about opening them or keeping them in box.