Going back to the original question - are they really worth it? Yes... We could ask the same about cars: Well, is a Porsche worth it? Is a Mercedes worth it? Is a Ford worth it? It is up to the person who buys it. Low price scopes do have a place...they teach us to watch our pennies next time when they fail! When I was young, newly married, I had Leupold tastes but a Tasco budget. My first firearms purchases were used. When I did graduate to a new firearm, I saved a bit and bought a Weaver 3x9 that sat on my economy model Stevens 110-E .30-06 for 25 years, lots of hunts, lots of shooting (I reloaded with a Lee Loader kit)...no problem. My uncle was business man who had the bucks...he had the big name rifles (Browning, Sako, etc) and the better scopes. Leupolds were his favorites but he also had a few Weavers and Redfields mixed in. Scopes that failed me were all variables (Bushnell and Simmons).
If I were to get an opportunity for the hunt of a lifetime, I would probably have the funds as well and spend the extra to get the best scope I could afford. At a minimum it will be a Leupold 4X (which by the way is under $300 in most places).