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If you have a focus in your book collection you can hope for some reasonable degree of completeness. A focused collection reflects much better who you are and what your desires are. It distinguishes a Personal Collection from a Library.
A focused collection which has achieved a good degree of completeness, attracts qualitative interest in the case you wish to sell some day. In simple words it has a higher value.
Last, focused collections can be pursued with limited budgets. Otherwise no amount of money is enough.
See below for more details about Collection-Focus keywords.