That's not the point - it may not be cheaper (if you get very unlucky) but it's guaranteed over time. I went through the entirety of S2 and never saw anything higher than +12.
Also, there are like 55 pages of botted steel on the MP right now with stacks ranging from 1 to 97 (many high stack listings). So tbh availability of steel doesn't seem to be an issue. Availability of gold to buy the steel might be a problem for some players, but that doesn't devalue the reforging system imo.