So i have the same problem that probably many people have. scales!
There are not to many ways to get them. But there can be interesting (and balanced!) ways to help:
Could there be a Scale shop added in the future?
as example, 1x 1* scale > 5000 coins - 1x 2* scale > 25000 coins, (or maybe fish instead)
of course this needs a limit, a good limit would be (in my opinion) max 10 scale purchases per day. (2* scale counts as 2)
3 star scales should never be sold as they are supposed to be hard to get.
Also maybe a repeatable scenario? currently we have one that gives fish/coins, maybe there could be one added that gives 1 or 2 scales per time (again, never 3 star scales)
also a fun and usefull feature could be a weekly resetting scale quest, which you can choose the colour from. (maybe a hard final boss stage with 1x 3* scale of choice?) do not make this quest resettable with runes or anything to prevent it from being overpowered. really limit of 1 a week.
At last (we discussed about this for some time with all our clans)
We would love to see a (dragon) trading system in the future. Which means player A and player B can trade dragons with eachother, with a 50 rune fee per trade (+25 for every star higher then 1)
also this will most likely have to be limited to 1 trade per person per week.
scale shop (without 3 scales)
*weekly resetting scale quest (colour of choice)
*possibly a repeatable scale quest (instead of fish/coins
*trade system (guild only)
I’m pretty sure many people will like this, and balanced too!