Osie, if you are after catching big carp, then a definite YES, it is worth all the effort. And no you dont need weeks of preparation. At least half of my sessions have been 2-day/overnight sessions and have had many good fish from it.
Yes, it can be quite complicated, because we're not just fishing for anything that bites, we are trying to outwit the big ones. BUT, it does not have to be complicated either.
In my opinion its not just about catching that 40 or 50lber. Yes, each one of us has a target size in mind that we want to catch, but on the road to that 50 there are plenty 20, 30 and 40lb carp to be caught and enjoyed. Its about catching big carp, and anyone who's had their share of 30lb+ carp will tell you that they enjoy every biggie they catch, as each one is unique...
Blanking is part of the game, and even in conv. fishing guys blank. Blanking is not nice, but I have learnt alot from them and it is part of big carp fishing... big carp are more weary so you have to outwit them...so sometimes the carp wins, lol!
But I can tell you that the better you get at specimen carp fishing, the less you blank. Suppose thats the same for any sport really... over the last year I've had very few blank sessions...
I'm not sure if specimen fishing is that much more expensive than conv. fishing... give me 2 rods, banksticks, some hair rigs, and a bucket of maize and I'll be set for an overnighter!