It makes sense, esp. as what’s really being sold is urgency. Anyone can charge at home for darned near nothing, or at the $1/hr convenience chargers for $4 per “fill up”. The profit-makers will also have other expenses like location, competing with faster customer rotation at gas stations. Even at a high of $12/charge, that’s at the lowest possible for comparable gas cars ($48/tank).
Here is an article about quick charging costs. Note the date of the article and the cost to charge. I would assume the cost would eventually come down if EV's become more popular.