I don't understand what it's like to be a hoarder and have never known anyone who is. Do they give you things for sentimental reasons? I think that would even bother me if it was a sentimental gift, simply because it seems like you are rejecting a gift that has been given. I usually give very thoughtful gifts so I get upset when I find out other people don't like them. I would much rather not tell someone that I hated the gift they gave me lol.
I would be really sad if I painted art for someone and they decided to just give it away for example.
I still have this big telescope in my house and I never use it and I hate the darn thing taking up space but my parent's got it for me and it was probably the most sweetest gift they've ever given me because they know how fond I am of memories I have of the olden days stargazing with my dad. I once threatened to get rid of it because it takes up so much space and it made them really sad so I kept it and everytime they come to my house they like to see it there. I am not given sentimental gifts all the time so it's not like I've had to keep anything else. I have no problems getting rid of stuff that has no meaning, but as soon as I know it has meaning to the other person, I don't think I could throw it away. Like that darn telescope... but in a way I love it because it makes me happy to know they cared that much about me haha. I guess it would suck for me if I had someone give me terrible sentimental gifts all the time, I would eventually have to tell them to stop because I have no room but fortunately my friends and loved ones are not very sentimental people.