In my opinion, any object worths it if it is useful to you more than the amount of money you have spent on it.
If you want to have the feeling of having the most indestructible knife on the planet and if you believe this feeling deserves the money for a Busse knife, then it worths it. If you want to impress your neigbours by showing them you have the most indestructible knife on Earth and you feel this makes you enough happy that it worths to pay those money for it, then it worths it. If you intend to cut nails, screws, thick metal wire and you want to do this with a knife while you have other more obvious choices, then it worths it.
Practically speaking, the only advantage of a Busse Combat knife is the indestructibility of its INFI steel and nothing else (the indestructibility given by the fact it does not chip while hiting dull materials). INFI does not poseses the best edge retention, it does not poseses the best edge achieveing ability, it does not poseses the best shock resistence, it does not poseses the best corosion resistence, it does not have the most obvious ease of sharpening and its records on lateral strenght are still discutable since many big knifes have comparable lateral strength regardless the steel they are made from. INFI is only a good balance of all of these properties and has as a big advantage only the fact it does not chip at 59HRC if it hits hard materials. Furthermore, the designs of Busse knives are not at all the best. A proper design for a knife is half of its practical value. But Busses are heavy, most of them have a too thick tip and the overall design is good only for a few kind of cuts and for chopping. They stuck in wood when you use them for batonning and the tip of most busse knives penetrates with too much efort and difficulty soft materials such of flash covered by warmly dressing (compared to an AK-47 bayonet or to a Fallkniven knife for example).
Busses ARE NOT the best knives on the market from the practical point of view. And their value constantly increasing on the secondary market is given only by what psychologists call "The Principle of Insufficiency". Busse Combat does not produce a coherent line of knives such as companies which have discovered an optimised practical knife design do. They put on sale a particular model for a couple of months and then they change to another design and another name. People know they cannot find a particular knife for too long and they feel that knife has a very high value just because it will be more and more rarely to find after the stock finishes. Jerry Busse knows this and he concentrates only on making of newer designs to replace the existing ones and so on. Also, the words "limited edition" are very often used on the Busse Combat site. So, the value of these knives are especially given by the marketing strategy. If you don't believe me, just think about this: If a knife design is so good, ergonomic and optimised, why it is not produced again and again in "non limited at all" editions and why isn't the production growing constantly all over the world?? This should be a natural consequence of a really revolutionary good quality product: the company would extend and the production would constantly grow and that product would soon become easily available all over the world because its purchase is guaranteed by its quality. But with Busses, this natural law is not working, so, it means Busses are not so revolutionary as they seem to be and their success on the market is maintained by the principle of insuficiency.
There are much beter knives out there for any kind of works and for all-in-one or survival too, but I don't want to give examples because I don't want to make advertising. The best knife IS NOT the one which is more resistent when used for things that are not supposed to be acomplished with a knife, and the best knife IS NOT the one wich resists better when used in an inadequate way. The best knife is the one which performs the tasks (which it is intended for) in the best and optimised way possible.
Best Regards!