You know that we could debate forever about prices!! My opinion is that they are too expensive anyway. Look what you get: a flat 3mm or so chassis, a couple of bulkheads, some other litlle stuff, and a diff. Whatever you're going to pay it'll be always too much
Reality is that rationality is nowhere near this hobby.
If you choose to race pan cars you mustn't do it beacuse of little money. That's a bad mentality in racing.
About Motonica: that could be a good deal, but you pay what you get. A good car + a good basic engine + basic stuff = basic racing.