"scam ... look at castle clash its 150 gem for one roll here its 250"
You get jewels a lot faster in CoL 2. For example you get 50 jewels in CoL2 for doing 5 lords league battles daily compared to 15 for doing 3 in CoL 1.
Besides even if it wasn't lol how's that a scam? Players are in competition with each other. If its harder for one player it'll be harder for your opponent. If you don't think its worth money to buy jewels than don't