The problem with jungle items is that they are way too cost efficient
On any given jungle item, with just ONE of the stats already gives more stats than the 1500g you purchased with
For instance, Magus enchantment:
80 AP and 20% CDR
80 AP alone on this item is worth 1600g, already being cost efficient without the half of max cdr
Devourers isn't as cost efficient with the attack speed, but the magic damage on hit is worth way more than the CDR on magus is
Warrior enchantment, The Attack damage on this item alone is worth 1620g, once again more than the buying price, never mind the price of armor pen and cdr
Juggernaut enchantment is a little less cost efficient with the health, with the value of health being 1460g, but you also get cooldown reduction and tenacity, something that is only aquirable from two none consumable items.
Yeah I'd be ok with these items if the price was DOUBLED