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MVSNYCYOU make the rules...there's no manual.
i've owned tons of cards over the last 20 years...i have phases...sometimes i'll have 100's of cards on hand, and other times, i'll clean it all out, and have just a handful of cards, which are usually very rare or high-grade...it is cyclical for me...
i have a small, yet valuable collection of T206 rare backs and color errors...that is probably less than 20 cards...BUT, then i also have been working on a little "side project"...which is a raw T206 set. many people i know who have a "25" or "50" card collection, have other things on the "side", which are NOT part of the smaller, tighter collection.
pick a number, could be 17 for that matter, whatever, pick a number, and that'll be your target size of the collection. WHEN you buy a card, you might challenge yourself to pick your "weakest" card and sell it...that way you'll alsways have a set number of cards, but it is constently getting "upgraded"...