I don't think a few of us using Gimp (yes, I am an occassional user) will stand in the way of convenience winning. Hige majority of people do (and will) use Photoshop, simply because it meets their needs better.
That's hardly the case; they are not even aware of the existence of alternatives.
Most of people's occasional image fix-up needs could be met just by MS Paint, which they would find easier to use. Problem is, they don't even know that exists and that they have it pre-installed, let alone that GIMP exists.
A quick Google search for cheap/free Photoshop alternatives will usually get people to GIMP in a couple of clicks. Why are you saying that Photoshop users are unaware of any alternatives? It seems logical to me that anyone in the market for this kind of software would be interested in saving some money before shelling out for PS. Am I wrong?