As a seller of parts I can definitely state that the most expensive engine you can buy is an incomplete model unless you already have the parts for it, all too often I ship orders totalling almost as much as what complete engines sell for so a buyer can complete his Ebay bargain.
you are quite correct Frank, I also have suffered from buying an item while saying to myself...that looks like an easy fix....only to spend hour upon hour fixing it up to my standards & thinking nothing about dumping more money in it than its worth, but I figure I'm gaining experience & knowledge about the thing (at least that's what I keep telling myself)