When adding a new shared parameter to an annotation, Revit will give the parameter name as sample value. This may be in order for text parameters but is misleading if the parameter were a number, a length, a mass, a boolean etc. The idea would be to provide a sample value depending on the parameter type and render "Text" for a text parameter, "0" (that's a zero) for an integer parameter "0.0000" for a floating point number parameter or "0.00 mm" for a length parameter (Revit would gather the unit from the family file).
