I guess the problem is you need to pay a significant amount of money to file a claim. Interestingly, some have advocated the same method for preventing spam in email by requiring you to pay a very small amount every time you send one.
Now think a second about the useful things emails are used for which text messages generally can't be: notifications for new releases of OSS projects or replies to a blog comment, mailing lists for OSS developers or hobbies...