I'll say this. I too have a "hobby business". Not a micro business, not a pico business, but more like a femto or even atto business. As I've discussed a few times here before, I make Sistra (Sistrums), an ancient Egyptian musical instrument. I make them up in batches 5 at at time when I can get all the parts I need, and I feel like working on the darn things. But when they go up for sale, I jump through hoops to make my customers happy.
I found and installed custom decorations for one customer, and my latest one I ran like crazy to get it shipped out 2 day air so she'd have the thing in time for some kind of consecration ceremony she needed it for. My customers love them, and I've never had a send back or complaint - but if I did, I'd do whatever it took to fix the problem! Hell, I even sold one to "a Major Museum". I'm not sure what they wanted with it, perhaps as a "modern reproduction" in their ancient Egyptian exhibit?
Even for a tinsy-weensy little production like mine is, I have procurement problems. Stuff that was available from one vendor suddenly isn't, or the FFF (Form, Fit, Function) has changed. Latest fiasco: This thing uses brass finger cymbals ("Zills") such as we Belly Dancers play when dancing. However, Belly Dancers - including myself - have all gone to a double slot style as the cymbal is far more stable on the finger. I need the old fashioned type with a single hole - kind of hard to find. I've been importing them from Turkey for several years. Latest batch showed up, and it turns out they weren't brass at all, but rather gold alodined steel. Unacceptable. I had to hurry up and find a new supplier - turns out Amazon has some that are actually the nicest I've seen for my application. Probably "Hecho En China", but what else are you gonna do? I got the test batch in just in time to put them on the Sistrum that had been ordered and went out 2 day air. I care about my product, so I've ordered enough for 2 batches (10 total) this month, and I'll probably order more in the next several months and just stock up so I don't have to deal with this chickenshit problem for a few years (I sell about 5 a year).
So - Hobby or not - poor customer service isn't acceptable.