exactly, MD! that's what i think..
but as brit noticed, the difference is that "temporary marriage" INITIALLY set for the limited period... why people find this fact inconvenient? i don't know...
By the way, it is not necessary that the period of marriage is short… One can conclude a 100-years term marriage contract...the idea is to specify the term.
And by the way, when you are concluding "normal", "non-temporary" marriage, why do you need to make a Marriage Contract then? describing every single detail what is going to whom in case of divorce? Isn't that "immoral" as well?
Even in Shariat Court they asked me:
first: How much do you want to get from your husband before the marriage?
The second question was: "How much do you want from your husband in case of divorce ?"..
well, since the question was made quite straight, I was not shy to indicate the figure.. why would I?
so again, isnt all that the variations of the "temporary" marriage?? everything is temporary in this life: jobs, friends, houses, habits, goals...the Life itself is temporary...
why the marriage wouldn't be?

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"What lies behind us and what lies before us are small compared to what lies within us."
Oliver Wendell Holmes