My two cents: the idea to buy with nuggets too its bad, you don't wanna see what happened to the new .ro world, where at level 1 they were equipped with items of 4k value (shawls ftw) and they had energy non stop and dueling motivation. UP sux right now, make it 5 times the cost in nuggets or eliminate the option.
Why are not the 1 day premium medals availible to buy in the shop ?
For players that are not active every day.
For example if your premium is ending and you know you will not be playing for over a week ( vacation or something ) but you still have 2 days to play before you leave.
Now you only have the option to buy two weeks of premium or play non premium for the two days.
You might even make them nuggets only in the shop i know you dont want to implement the option to buy premium with ingame currency.