Well I just collected my 550th a few days ago.... so I guess it does lol.

Neison: OMGz you haz Treasure Flower and Rose, gimme them, I wants it -__-

Anywho, you can only increase capacity so much. Eventually you'll have a surplus of FGs, I say heck with it and roll some Gatchas, that's half of the fun of the game. Or save 'em if there's a specific event coming up in which a girl you want is going to be there. Tho I'm having same issue, save FGs or use them, RNG is a b**ch, just something all of us need to live with.