Does the amount of routes to/from a destination/departure in a route impact the rate of route image growth? I.E. 1 flight per day vs 10 flights per day...will teh route image grow faster if i have 10 flights a day rather than 1?
No, frequency doesn't seem to have any appreciable effect on it.
As long as you're going 7 times per week it grows at the same rate as 21 times. Less than 7 (or perhaps its 6, I can't remember) though will cause it to slow.