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Not so much scarce as the fact that I use them when I have them.
You have done really well to clear 226 levels without using any boosters, so seeing as you are stuck it surely makes sense to use whatever tools you have at your disposal.
Don't make the mistake of saving for a rainy day as they say. There will always be more difficult levels that you haven't played, but you will have won more boosters by then as well.