>see the 10-15% dent I put on a 50ml in a few weeks
>realize I have 8 other bottles for the same role
The best set up for me, as someone who buys discontinued fragrances, is one 200ml I can go HAM and a handful of 50ml I can rotate and sample without worrying about levels. I think I just cured myself of buying backups, but it's always tempting.