using the ndame/ip allows you to connect from any machine that you can get the software on, without you needing to remember the long number.
Also, if you did something untoward, say against the EULA, Sling could not just remove your Sling ID from their server and leave you without access.
There are some other reasons, but, those should suffice.
"Good behavior is the last refuge of mediocrity." - Henry S. Haskins


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