I like to have more than I need because you never know what could happen with a grow
New genetics that aren't good...(hermies, bad taste, fluffy buds) bugs, mold ... I mean the list of bad shit is endless..... It's nice to have something to fall back on ...just in case. Plus making shit is fun. I'm learning how to make diamonds and I've 'wasted' alot of rosin but I could care less really. Nice to feel that way instead of relying on a single run.