WRT $3k walking out the door, I doubt Hanners has much concept of what that means; she has never wanted for money. Now, if Dora decided that maybe she shouldn't be held to an agreement made without proper information, she could probably make it stick; it depends on how much she cares if Hanners gets mad at her. We're also taking Brun's word for the valuation, which may not be justified.
I can see Dora getting angry, or at the least, annoyed, with Hanners for this. Coffee of Doom is doing alright, but at the same time, alright can change very quickly. That's a sizeable chunk of change for a small business; I've worked in a small shop and depending on the time of year, that 3000 could easily be several days takings. For Hanners, its a gift for her friend. For Dora, that's wages and bills and stock going out the door.
Then again, this reminds me of "Time on Our Hands", the 1996 episode of Only Fools & Horses, where the main characters found they had an incredibly valuable watch in storage for years and it ended up selling at auction for several million.
As great as the miscommunication about the clock is, I think the part that amuses me most about this strip is the waiver to visit the basement. Or specifically that there's enough of a demand to visit the basement that they even need to have a waiver pre-drafted.
Its a health and safety concern. A coffee roaster for a shop like that, depending on when it was made, would be a hefty piece of industrial equipment. Dora knows how to use it, Hanners too. But Brun doesn't and could potentially be injured if she were to mess around with it. The waiver might seem like a joke, but Dora is just watching out for herself and her business with that waiver.