It may simply be my own questionable luck, but I have been experimenting with nubbin scraping for the greater part of this entire day, and seem to receive 1 ice per scrape more often than not.
Is there a reason for keeping the harvest so low? Does TS intend to release upgrades to increase it, similar to the harvesting upgrades for other resources? It seems peculiar that my glitch would only manage to garner one little cube from a nubbin whose image appears to have at least a dozen on it.