Lets say with 100% mastery and 13% crit your poisons hit for 100k and 200k on crit. so in 100 poison attacks you would have:
(100k * 87) + (200k * 13)
8700k + 2600k
11300k or 11.3mil damage
Whereas with RoR you would have flat damage ie no crits so lets say 270% mastery which equates to 185k per poison attack
185k * 100
18500k or 18.5mil
Obviously the amount of poison attacks would be less due to haste loss, but the damage difference means that 100% of our poison attack would be doing near crit damage.
so lets say you run with 20% haste normally, and give 20 extra attacks to non-RoR example, and ill even round up the amount of crits rather than down. (3 not 2.6)
(100k * 104) + (200k * 16)
10400k + 3200k
13600k or 13.6mil damage
still a fair way behind ToB/RoR abuse.
Obviously this is all rough calculations just to show the theory.
EDIT: Have not added in crit from agility and buffs, which would in fact make TobRor even further ahead. Just so you know