Well, it took me using a few apples yesterday to get back on track but now I'm sure I could clear the shop if I wanted on natural regen alone - I'll definitely get my target items quite easily. Event feels much more enjoyable once you shed the feeling that you're sinking in quicksand; probably helps that I have pretty much all the bonus Servants. A friend of mine said they didn't have any pill or peach Servants so it was really slow going for them.