Well I can certainly understand the children under 3 and people who want to be tested for fun (what a waste of valuable mental health resources...
).
The alcohol thing seems somewhat unusual, as I saw many clients with alcohol abuse/dependence at my university's clinic, however, most had other axis I diagnosis as well. University clinics are limited in the scope of services they can provide since they are generally just staffed with psychologists and grad students, and typically don't have consulting psychiatrists for management of comorbid medical issues or medication. I would also say that clients who have heavy alcohol dependencies can have medical complications due to heavy drinking as well (DTs, low thiamine levels) When this is the case, or at least a high risk, these patients are best handled in other environments or by medical trained mental health experts. Also, treating chemical dependency, and chemical dependency only, is generally not a specialty area of many psychologists. Therefore, it is quite plausible that many clinics feel they don't have the expertise to fully treat full blown etoh/drug dependencies,..hence, they refer these clients to more appropriate and specialized centers and/or therapists.