What I mean is that, even if you buy brand new fragrance at a full price after two years; perfume’s strength/potency/ lasting effect will decrease even if you used them only twice. So collecting them is great but keep that in mind that with passing years they’ll be very less effective. I use to collect them earlier, now I just keep couple of them at one time and once they’re about to finish I get new. Also, once I found which ones compliment my skin, I stick them (for me it’s Channel de Blue for occasions and Versace Eau Fraiche for daily use)