I owned a 92 Allante. Yes, price wise they are "dirt cheap."
However, they are high maintenance and expensive to maintain. Some parts are in the "unobtainable" category or very expensive; Speed Dependent Damping (SDD), the Bosch brake system, headlights. Moreover, the interior hardware is, for lack of a better term, "cheap plastic." Over time it becomes brittle and easily broken.
One has to be devoted to the marque and have very deep pockets to properly maintain an Allante.