As an American Exapt living in Hungary, to me in fact as well in theory, spending a few pennies to reduce a work load of course may make sense.
But here in my locale the monthly income is only about $300 a month. And most people here have mass heaters which require two hot firings a day (morning and evenings). So that amounts to about $6 a month, in local absolute cost, just to start their fires. But absolute costs are not important, what is important is relative costs. At $300 a month income, if one uses a "median" American income of $36,000 as a relative equivalent, it would cost about $60 a month just to start fires here using such fire starting squares. As a relative comparison, I doubt a $60 monthly expense is worth it, even in the states, when junk mail paper is free.
Just something to think about.