Why is it so difficult to get stickers?

Why is it so difficult to get stickers? When there's 15-20 of us playing and none of us have the same sticker we all need seems a little bit much.. There has to be an easier way to get stickers. We all keep getting the same.. And the dice is not enough.. We all love this game. We should be able to send the one that say not gifted to each other. We always have extra but can't help each other out. Tjen today I didn't get my purple pack of stickers or dice.. That's not the first time. When we all have things we accomplished and don't receive our stuff, what do we do. It's not right. For two weeks we have all been trying to get some of the same stickers and we can't.. Why? We don't wanna stop playing this game.. We all wanna know why? And what can you do to fix it? Thank you