Hello, before I begin, I would like to describe myself. I have been playing Clash of Clans for about 8 months now TH9, and I will admit, I like to purchase gems with leftover money. And that's why Clash of Clans created them. For them to be bought. But I have bought so much, why not have a benefit for those who buy large amounts of gems? My solution!
Every time you spend $50 in gems for Clash of Clans, you get 25% off your next purchase of gems. Then every other gem purchase a percentage of the cost is taken out, either 2% - 4%, or something like that until you spend $50 more.
So for example, I spend $50 on gems. My next purchase is $10 in gems, but since I have spent $50 I receive my benefit of 25% off and my total is $7.50. Then I spend $20 in gems again, and since I have already used my benefit of 25% off, so now I receive my benefit of 5% until I reach $50 spent again, so my total would be $19.20.
*I did round up to the tens*
Please leave feedback below, and if not everything is clear to you, I will respond shortly. Thanks, and have a geat day.

