We'll see. It's a constant arms race. They've been trying to create effective copy protection for at least 25 years now on the desktop, and still the apps get cracked before they even hit the shelves. A jailbroken iPhone is just a computer, so we shouldn't expect any difference.
For €30, as long as the tool doesn't cause problems of its own for your legitimate users, why not? But that's a major caveat. You have to figure the cost of the tool, the cost of your deploying it, and the cost of every lost customer due to problems, against the number of additional sales you actually make due to freeloaders now paying for your product. Very few freeloaders actually become paying customers; most will just not use the software. So there's not a lot of revenue available to offset the cost of protection.
Remember that last bit; very few freeloaders will ever become paying customers, and their using your product costs you nothing. In fact, it gives you a level of free advertising. So I generally encourage developers to spend their time making their product so awesome that their legitimate customers make them tons of money. Fighting freeloaders mostly distracts from that.
My expectation: Hackulous will figure out how to crack AntiCrack automatically (since it's a single target), making it worthless. AntiCrack will release a new version, making it worthwhile (at which point you'll need to rev your software). Hackulous will crack it again. AntiCrack will update, and so will you. Wash, rinse, repeat.
Apple spends big bucks to prevent jailbreaking. They have control over the hardware and software. How's that worked for them? Anyone think a €30 magic bullet is going to fare better?