I don't see how another few MBs dedicated to a good sounding expanded soundtrack would hurt anybody. After a quick check on Usage in my iPhone's settings and Graal's files using iFile, I discovered that in total iClassic takes up about 162 MB of data, which is nothing compared to what it used to take up before I reinstalled it, which was 756 MB. Out of those 162 MB, only 12 MB were taken up by the 14 tracks used in iClassic. While that may seem like a lot, consider this: The tileset, soundtrack, and other data that comes with the app when it is first downloaded takes up approximately 19 MB according to the App Store description. This amount of data is constant, since it is made up of things that do not change and are necessary for the game to function properly. Considering the fact that an average uncompressed MP3 file takes up about 4-6 MB and the low memory use of iClassic's 2D not-very-complex graphics, it is normal that the soundtrack takes up most of the memory when downloaded.
At least at first, it takes up the most memory.
At this point, you may be wondering what the other 143 MB are. The amount of extra MB may differ for you, so you should check how much memory iClassic takes up for you in Usage. This extra memory is taken up by the absurd number of graphics and extra, somewhat unnecessary data downloaded onto your device. The majority, however, is graphics. Graphics uploaded by players, extra hats, things that do not come with the initial download of the game. It looks like it would take up a tiny amount of memory, but small things add up, leading to iClassic taking up far more memory than it is said to take up. With graphics constantly being uploaded and taking up more and more memory, it is safe to say that regardless of whether the tileset or soundtrack is updated, the game's memory usage will continue to rise. Therefore, a few MB dedicated to a soundtrack expansion or a tileset update to improve the gaming experience is trivial in comparison to the massive number of graphic that are uploaded, the grand majority of which do not improve upon the game itself at all.