It isn't really that tough of a back to find unless you are looking for a particular subject with the back.
The numbers are a little skewed because out of the 524 fronts only 34 come with the back. So if out of the 478 cards you have records on included 1 of each of the possible fronts that come with this back then that means only 7% of the cards in your records could have possibly had the back in the first place. Then if you weren't concerned with the back type you had aprox 1/11 (9%) chance of getting this particular back. That comes to you having a 6.3% chance of getting this back in the 478 cards, which you hit those odds by getting 3 of them.
I don't think it is rarer to find one if you want them but randomly getting them in your collection is a little harder depending on what you are looking for.
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