Worthless Marketplace items such as hourglass of enfeeblement. Why are mine never deployed?

Some time ago I used all of my market place tokens to purchase 30 hour glasses of enfeeblement, but even though I've owned them for months they are never used against opponents, who are mostly 2 to 5 times my level, and chain attack me at will.

Furthermore, such items are regularly deployed against me. Why is that the case? What use are they if the game never uses them for me, and why are others able to use theirs against me? Is their some button I'm supposed to push to make this happen? This is very frustrating, especially since most of the chain attackers these days are only attacking me to kill me. They get nothing else from the attacks. Most of the time they get no money,and almost always, they get no demi-points and virtually no battle points. I'd at least like it to cost them extra stamina points for their cowardly attacks.

my guess would be they have Hourglass of Endurance since it counters Hourglass of Enfeeblement. they are used at random but my theory is that if someone attacks you and you used the Enfeeblement, if the attacker has an Endurance, it will automatically take effect and counter Enfeeblement. you don't lose your Enfeeblement but they expend their Endurance. this is just my thoughts on how the hourglasses work. i don't get many yellow gems from people so i don't have a ton of Enfeeblement like all the others, but i rarely see the number change. i've been sitting on 44 of them for awhile now which leads me to think that it doesn't get used if it's countered.