As yet another Deus Ex loving, charged-item-hoarding packrat, I can echo the general sentiment of the thread.
The issue for me is that essentially each use is throwing away an (often nontrivial) permenant resource. Which is why packrats like me find it so much easier to use the X/day items.
Scrolls, potions, and 1-2/day items of course also suffer from the what-if-i-need-it-later syndrome worse than wands due to the smaller number of charges generally available.
It's a difficult balance to strike. If items are potent and expensive, they never get used, being saved for the rainy day that never comes. If they're potent and cheap, or impotent and expensive, the problems are obvious. If they're impotent and inexpensive, as with CL1 wands, then they're only useful when action economy is a nonissue, e.g. out of combat healing.
But a good midpoint should be attainable. I know I'd kill for some halfway lethal grenades, even if they weren't cheap.