i have noticed that two abilities are most of the time extremly useless
1) gold-o-rama and it is repeated(just to mention) so i won't detail
2)storm rider: it is said that it is good in long runs but i will say even in long runs it is kindda useless , how so ?
let's do some math
exp point are earned every 5 hours , storm rider is available once in every 4h (if u have 50% cd trinket)
the calcul will be the bonus to the original attack
exp point-----storm rider-----time played
0-------------1,05-------------4
1-------------1,05-------------5
1-------------1,1025-----------8
2-------------1,1025----------10
2-------------1,1576----------12
3-------------1,1576----------15
3-------------1,2155----------16
4-------------1,2155----------20
5-------------1,2762----------24
5-------------1,2762----------25
6-------------1,3400----------28
6-------------1,3400----------30
8-------------1.4774----------40
12------------1.7958----------60
16------------2.1827----------80
20------------2.6532---------100
40-----------7.0396----------200
60-----------18.6771---------300
80-----------49.5559---------400
so basicly to have yr original attack miltuplied by 2 u has to activate storm rider 18-19 times
and we all know that much is nothing , so only at really long long time activating storm rider will get u to something (since it is multiplicative) otherwise useless

Your math is wrong since stormrider don't multiply itself.
Any everyone would use magnify before stormrider for 7.5

For some more math. Since exp also is additvly. It actully get worse then magnify+storm rider after some time.
For this to happen (If you always magnify stormsrider when u can):

With 0% cd (magnify stormrider each 8 hrs). At 170 hrs. That Exp point will increase your dmg with 2.9412% and the magnify + stormrider at 168 hrs will increase your dmg with 3%

When u get more then 37.5% cd, magnify+fire storm will never be better then EXP since it will have it intervals of increases more often.
and the closer you are to 37.5% cd the more time it will take before magnify+storm rider gets better.

Edit: Just realizes I should have done math for 5% cd. Since Thalia got 5% cd upgrade.