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The great thing about the 7130e is that it's an alternative to the full-sized models. Just as you love having a single letter per key, others love having a "regular cell phone sized" BlackBerry, and they're willing to trade-off the qwerty keyboard vs carrying (what seems like to them to be) a brick.
FWIW, although far from 100% perfect, the SureType software that BlackBerry uses makes "two letters on one key" almost a non-issue. Press the key that you want (once), and it guesses what letter you meant based on the next few keys you press. Definately a huge step up from T9, where if you want to type the 3rd letter on a key, you have to press that key 3x.