It's rewarding in that you're achieving all of your neopoint-related wants quickly with little effort,
but with most game hacks (not just Neopets), the allure of playing is gradually lost once you take the easy route out.
That hardly matters, however. At the end of the day, one must remember this is still a kids game without long-term reward, you otherwise blow countless real hours into disposablepixels, forsaking goals in reality.
More compelling is how easy it is for any player on Neopets to lose their account, legit or not.
That's a common scenario as to why the bulk of players are on clraik, or cheating in neopets at all.Imagine playing by the rules for hours each day for years, becoming somewhat successful with 'xx' million legitimately earned NP or UCs, even reporting the occasional cheater to make the game community a 'better place'. Then you go to sleep and wake up the next day to your account being frozen and you're dumbfounded as to why. You wait weeks to months for a response from TNT, confident you'll get it back, only to never receive a response, or a false accusation from TNT that you cheated and your account will never be returned.
If things weren't so dodgy and could be attained legitimately, then players would have less reason to cheat.
But since the reality is your account could be taken from you at any moment regardless of the time or effort you put in, why bother?
It's just a game, cheat away.
If you value your main account and it hasn't been frozen yet though, then I'd advise not cheating on it, researching carefully how to best do it before starting, and accepting the increased risk of getting it frozen. You can be skilled at cheating, but nonetheless, it will put any account you do it on under greater odds of being caught.
Maybe experiment on a shell account first (under proxy so you're not IP chained to your main if you're busted), so you lose nothing if that's frozen; and transfer your earnings to your main once you're confident you have everything down.