Though there are some who just don't think the Bible is worth reading, that is only about 21%. They may be atheists or of some religion that has its own book that is held as sacred. If 25% have read it and 21% don't want to that leaves 54% that say they want to but haven't.
Of that group most are probably intimidated by the Bible. It is a large book and believed by 56% of Americans to be hard to read (some translations are more difficult than others). If you are in this group don't allow fear of the unknown to keep you from some wonderful truths. As we begin reading anything that is unfamiliar it may be difficult, but with practice and experience it becomes easier. Don't worry about the weird names either, even the scholars don't know how to say some of them. If you have trouble understanding get help like the man in Acts 8:30-31. Got Bible questions? Ask me.