Note that they doubled the base EXP monsters are worth in the December 2013 update, so Even Match became worth 200 EXP instead of 100. That means with the new 150% boost ring, it's now 500 EXP for an Even Match. We're at essentially 500% EXP versus when the game launched, and you can boost it higher with RoV key items and Corsairs. +90% (or +180% of old EXP rates) from RoV and +24% (48% versus old rates) from Corsair can lead to 728 EXP from an Even Match at level 1. It goes even higher as you level. People on BlueGartr are posting tens of thousands of EXP from a single kill, aka more than a merit point per kill.