Let's say that you have 100 locations and 1 wand hidden within them. Now, let's assume that you have 200 locations and 2 wands hidden within them.

Now, let's assume that your get a wand list from a friend, containing 30 locations, all of which are correct. Let's consider how this affects things in this new and current sleek system.

In current system, the chance of finding your wand in the locations in your list is 30%, for both cases (or more correctly, they can expect to find 0.3 wand locations fromt). It is also an insta win if you happen to find it, as the probability of finding wand in that same location is 100% after that.

In the new system, the initial probability of finding a wand is also 30%. However, if you find one of your two wands from those 30 locations, the probability of the wand repopping into those 30 locations in your list is only 15%. In addition, the reward is only one wand instead of guaranteed wand spot for the rest of the game.

1000 locations and 10 wands would make the probability a wand repop to your list's locations 3%. In all of these cases, the list gives you an initial advantage, which eventually diminishes as the wands eventually repop in to locations that are not in the list. If these wands are not found, the 30 locations eventually dry out, none of them containing a wand.

Let's think of the newbies, who do not possess wand lists. The odds of a newbie finding a sleek do not depend on the amount of possible wand locations, but rather, of number of wands/total locations in the game. Since total locations >> wand locations, newbies win if you add more wand locations while keeping the wand density the same. It'll actually become less tedious to find the wands without a list while the tedium of the list users increases.

As for Immortal work put in, the beauty of the system is that letting even compromised locations stay in the game helps to reduce the effectiveness of the lists in the long run as you keep adding new locations. You should also remember that longer the list, more the tedium involved in checking all of the list's spots. Not to mention that the new locations add to the immersion of the game in form of less repetition.