I make less coins killing a lvl 45 mob than i do a 42 mob while I'm 40.

04:02 Heaven's Voice: Combat Ironic123 vs Sinra Hangman is complete.
04:02 Heaven's Voice: You received 691 Experience.
04:02 Heaven's Voice: You received 12.

04:01 Heaven's Voice: Received: 1870 Experience, Simple Orb of Vampirism (50 pcs), 25 Protector Reputation.
04:01 Heaven's Voice: Combat Ironic123 vs Sinra Hangman is complete.
04:01 Heaven's Voice: You received 691 Experience.
04:01 Heaven's Voice: You received 1178.

04:00 Heaven's Voice: Combat Ironic123 vs Merciless Skrag is complete.
04:00 Heaven's Voice: You received 575 Experience.
04:00 Heaven's Voice: You received 1193.

04:00 Heaven's Voice: Combat Ironic123 vs Merciless Skrag is complete.
04:00 Heaven's Voice: You received 575 Experience.
04:00 Heaven's Voice: You received 1210.

Shouldn't it be more coins for a higher lvl mob? the 45 is colored red while the 42 is orange...doesn't that mean greater rewards from the red mob?
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Using Hours of Prosperity and Bag of significant Spoils together