Yeah no joke. Evidently the first generation Savannah (half serval/half regular) is incredibly difficult to produce. Servals and servals will fuck all day but they are extremely picky about mates that are different breeds. So a breeder may think he/she has the perfect pairing and the serval will be like, "fuck you, not interested." Then the males (savannahs) are sterile until they are 5th generation and watered down as hell. Breeders are trying to mostly mate serval with a few different domestics (Egyptian Mau, 1st-5th generation female savannahs with a male serval, and sometimes male serval + female bengal).
Plus, most breeders only offer 2nd generation and beyond... which is fine because they're still big and sweet, but only 10 breeders in the world produce true legit F1 Savannahs. Hence the expense.