My husband would be if I let him. He always wants to keep stuff that he will never use. If I come across something I will actually use or really want then I will keep it, otherwise no. His dad is worse. He used to rent a garage just to keep his stuff in. He is always buying stuff off of people and then just puts it in storage and never looks at it. Once, when my husband and I first started dating we went to help his dad clean out his garage because we where going to the flea market and his dad wanted us to try to sell some stuff for him...we spent HOURS going through everything and ended up with hardly any stuff to sell, and what he did want to sell he wanted way to much money for it so nobody wanted to buy it. Eventually he built his own garage now he has all his stuff in his back yard.
My mom too. She is a yard sale and dollar store shopaholic, and most of the stuff she buys she hardly uses. My dad makes sure the actual living area of the house is not piled with stuff, but anywhere else is filled. When I moved out it took her less then a month to fill my room with stuff, and I had the biggest bedroom in the house. Their house is a three bedroom, in my parent's room you can just get to their bed. Every once in awhile she will go through her stuff and then show up at my house with totes of coloring books, office supplies, craft supplies etc for the kids and then tell me she took stuff to my two sisters as well. lol
By husband's grandmom is another one. She's 89 and lives with my mother in law. She had their shed filled with stuff in no time, her thing is furniture. She is always buying furniture and little nick nacks and applicances.(washers dryers and fridges) She never uses them, right into the shed it goes and now she's rented a storage unit so she can get more stuff! There is no talking to her about it and my mother in law has refused to take her to anymore yard sales. Also, god forbid you throw anything away! She will go right out to the trash to get it. You go to get a baking dish or something and pull out a styrofoam container meat comes in. It drives my mother in law nuts. She washes them and then expects you to reuse them! Same with tinfoil. Our last unit we got a fridge, I had to lie to her and tell her it didn't work because she wanted to buy it and my mother in law was begging me with her eyes to not let her have it! If she comes to my house on trash night she will start taking things out of the trash. We have to keep her far away when I am having a yard sale. We have to keep my mom away when we have a yard sale too.