Just another thought… I agree 120K is good budget to open a nice store… now you are open: How much does it cost to get the phone to ring? How long until cash flow covers expenses? What is the value of increasing the certainty that the investment will not fail?
When you buy existing, you get a proven cash flow. (You can also get headaches… so it is certainly important to check things out) If that cash flow is producing a profit it has value. If it is producing significant, consistant value beyond a market wage for a manager it has substantial value.
If you are comparing costs to open with the value of a going concern you are comparing apples to oranges to a certain extent. Even though a new store buildout is pretty, it is still just a bunch of equipment until that investment is producing.