I'll smoke bong resin without hesitation when no other cannabis is available. Sure, it might taste a little nasty, but so do plenty of other drugs, and just because weed normally tastes nice doesn't mean it always has to.
When weed is unavailable or I can't afford it, or shit, I just don't happen to have any at that point and want to smoke, I'll scrape out the resin. I see no point in throwing away perfectly valuable material that will get me stoned. The collecting and preparing of resin is also a nice little ritual to relieve boredom, and it does ensure my bong stays reasonably clean.