My wife is having a book collection in her house which contains books from her kg class to degree completion. She is a great book work and don't give her book to any one. But i am not in her sort, always i give my books to my brother or junior students to help them for their studies.
In my opinion, there is nothing wrong in collecting books, but this book collection may give some pleasure and benefits to us, but if we give our books to other persons, they will get knowledge using our book and appreciate us for our help, this kind of appreciation will give some pleasure to us, also our book will help other to improve their knowledge it will give some satisfaction to us. This kind of book collections don't give this kind of satisfaction.
What about you? Do you give your books to other person or collecting your books like a library? some persons will give their old books to waste paper shop, do you have this kind of habit?