I think if a group of adventurers is walking around town being obvious about who they are, the townsfolk should be more likely to cower in their homes rather than run out trying to sell them things.
I like the "rock star" model.
At low level, the PCs are dreaming wannabes. The most likely reaction of the average peasant is to ask when they're going to give up on this nonsense and get a real trade. And, of course, the PCs have to find most of their own work, do their own publicity, and so on.
At mid level, the PCs have "made it". People get excited when they're in town, they have people paying for their stuff (well, coming to them with adventures), they attract shifty agents and all manner of hangers on, and so on.
And, of course, at high levels they're "rock gods". They're the sort of legendary perfomers that only occur once in a very great while - they're the Beatles, or Elvis, or Queen. While they're alive, they will be hailed wherever they go... but they can expect to die a legendary death in the near future. And, of course, even
that will only enhance their mystique!
Of course, all of these things can manifest in different ways. If the PCs are known as the Prince of Darkness, then they'll get a
very different reaction than if they're Cliff Richard.