The price of regular active & passive skills are a joke. We should increase the price by about 10,000%
Guard Crush would be 900k with Ion Wave topping off the chart at 2.3mil. That way people can stop spam buying those and taking them for granted. Since guard crush is the cheapest it would also entice noobs to learn how to use it and not spam rush/uppercut.
Now what about the noobs who are poor? Well I've already suggested a topic weeks ago that would give new players a better starting package that would allow them to use a skill of their choice for free along with other non-tradable coin items so that someone can't just make a new bot and send themselves free skills and coin items.
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Next, I do believe your idea of a mystery box would be cool if it was in different tiers. Such as this:
Small Mystery Box: 5m has a 15% chance of giving a rare item and 15% chance of giving Grand Mystery Box
5% chance of turning into a Deluxe Mystery box. The prize total will not equal more than what could be given from a Grand box.
Grand Mystery Box: 15m has a 20% chance of giving a rare item. 20% chance to give you a Small Mystery box and
10% chance of turning into a Deluxe Mystery box. The prize total will not equal more than what a Deluxe mystery box could give.
Deluxe Mystery box 45m has a 30% chance of giving a rare item. 20% chance to downgrade, can't pass ultimate in item worth.
Ultimate Mystery box 100m 45% chance of giving rare item. 5% chance to downgrade and no limit on what item it could give, but this has the largest pool of items so getting something extremely rare is unlikely, but very possible.
^ note those percentages are just examples.