Thanks for the correction - I missed that. You do lose them for the time they are breeding though, so I think I will include that.
It might make sense to save a guide for breeding for coins. Maybe in the breeding guide thread. Here's what I have - please look it over and check for accuracy and when it's right we can save it somewhere for future reference.
Air and Sandstorm Dragon - Per Hour Production: $123,230
Gross Sales Proceeds: $500,000
Lost Production, Average Air & Sandy (level 15): $7,080
Net Proceeds: $492,020
Optimal Access Frequency: 2 hours
Leap Year Dragon - Per Hour Production: $66,125
Gross Sales Proceeds: $2,500,000
Lost Production (level 10): <$384,000>
Net Proceeds: $2,116,000
Optimal Access Frequency: 16 hours
Snow Dragon - Per Hour Production: $61,300
Gross Sales Proceeds: $1,000,000
Lost Production: <$19,200>
Net Proceeds: $980,800
Optimal Access Frequency: 8 hours
Other possibilities I've missed?
Poppy