BTW, I didn't mean to completely discount the cost of new skates. I'm trying to budget for them myself. But you also should compare that to the potential costs of injury caused by badly fitting skates due to breakdown, or skates that no longer provide the necessary support - both of which the o.p. indicated - it's maybe tolerable. And if you count travel and other costs, and the lessons from which the o.p. maybe doesn't get full benefit because of the issues caused by skates, I would still claim that a good pair of properly fit skates are worth it. I economize on a lot of things. But economizing on some types of sports equipment, like skate boots, can be a false economy.
At least that is the way I see it.
And maybe I need to believe that making one's own insoles, etc., is a good idea, because I've spent a lot of time doing it, and experimenting with different techniques and materials, and discussing them with other people who have found their own techniques.