I'd set up the minimum offer level if you are stressed about it. I have a min offer acceptable on every item that I sell, with very few exceptions (and those are for listings that I'm not considering offers). I wasn't stressed about receiving offers, but I didn't want to have to re-think what my min acceptable would be - I find it best to set that limit when creating a listing.
The downside to setting min levels is that some buyers get fairly annoyed. They put in an offer, get an auto reject, and you never know that there is an offer on the table. After a buyer makes a few attempts, they give up. I've had several write to me, complaining that I'm not even responding to their offers. I have to explain how the min level works to them.
