Betty's Gold Get is also affected by 2/3 starting a map, so each unit she kills can potentially be worth 150 gold.
Want more reason why awakening her and the other gold get units is a good idea? Here's a video of AW Patra (plt bishop) and AW Lyra farming the extreme tier Monday daily map - the next map up from the H map we currently have.
http://sp.nicovideo.jp/watch/sm27551197
The normal gold reward for 1* on that map is 10,000 gold before gold get and any gold armors you sell.
Edit: Full disclosure, the other units are providing the following buffs in that video:
Aria - 2% attack power
Conrad - 5% attack power to Lyra
Kagura - 5% attack power
The Feng Shui user - increases mission gold reward 50%. Doesn't stack with Gold Get or Noel's Cane of Fertility passive