The 25% EXP boost for 30 coins is currently too expensive and not highly valued due to the presence of the Battle Tower and the additional effects of Membership, which are sufficient for fast leveling. Therefore, I suggest changing the 25% EXP boost as follows: make it similar to the annual event's EXP Share 6 with a 48-hour duration (72 hours is honestly not highly valued and I would never fully utilize it). You could reduce it to a 20% EXP boost or keep it as is.

raise the cost from 30 to 50 coins for 48 hrs event share. I likes ur iead +1 

+1, that's a good idea. 

I don't think it's profitable for developers..but I agree that 30cc is too high, personally I would prefer to lower it to 20cc or increase the exp boost over 1 week..