Yeah, the Profit you make is really good. But the amount of cases existing in the market and what the case contains makes the Price as well imo. There are more Breakout Cases in comparison the Phoenix and Phoenix is older, still Breakout Price is 1,60€ while Phoenix is around 0,75€, because the Buttefly Knives are in the Breakout Cases.
And look at Operation Hydra Cases, Maximum 3 Cases per User, now the Case is on 6€ after only 3 years, because there is nothing left of this cases.
So some factors that make the Price, but Summer Sale could be a factor as well in pricing.