Baron is a pushover and the reward massively out weights the risk
Baron isnt even a threat, it dies in single didget seconds (im not even fucking joking) and just auto wins you the game now with banner.
If your team is even slightly out of position (Im talking red buff here with no blast plant) they just kill it before you get there, fight you with full health and an instant 10k gold lead in stats, then just auto win because you cant stop a push.
Let me just sit here as a mid laner and auto this banner/baron siege minion to death. Mmm, 50 damage auto attacks for a 2k health pool! That'll get the job done!
If im the last one alive, and they have one enemy, i literally cannot stop the push to death. It would take over a solid minute of auto attacks to kill it and they will just kite me around as im a mage.
Baron buff is brokenly overpowered
Baron himself might as well be a melee minion.
https://www.youtube.com/watch?v=Sgnzq6gLET8&feature=youtu.be
Heres the game in question. Nautilus lost barely any health and we three manned this thing at 21 minutes, two items, in less than 20 seconds.
only adcs that build 
at level 12 with
is 167 AD
She would do 91 dmg per attack for non crits and 227 per crit. With 50% crit chance leaving the avg hit at 160.
Trist has a base attack speed of .656 and 70% in items and 18% from levels leaving here with 1.23 attacks per second without Q active or 196 Damage per second when her Q isn't active. It would take her 51 one seconds without damage sources to kill baron solo...
With her Q maxed and active she gets another 110%(this is the best attack steroid for killing baron and why i use trist) she would have an attack speed of 1.95 and would do 312 DPS or 32 seconds to 100-0 baron.
Her Q is active for 7 seconds out of 16 at max rank meaning giving her 43.75% up time
Giving her sustained DPS to baron about 227 which is around half of what
is doing in the video.
Her 100-0 would be closer to 40seconds. Call it 30-35 depending on the helpers and drakes.
You're doing like 400DPS in the video. Also you attack faster then Trist would at that point and twin bite one point away from maxed you have the better attack steroid.