The other difference...
The other difference, of course, is that the prostitute has another contract one hour later, but in both temporary and permanent marriage it is the duty of woman to wait for a couple of months before entering another contract. As I mentioned according to ALL of the Shia scholars the "Iddah" for the Mut'a is two menstrual cycles (or at least 45 days if the woman is of menstruating age but for some reason does not menstruate). This would provide less than 8 customers a year for a prostitute!!!
I think any prostitution agency would go bankrupt in the first year if it wants to follow the regulations of Mut'a. And there are many more differences between prostitution and temporary marriage. May Allah guide those who unknowingly ridicule His religion and His Prophet. Q3: Would someone give the hand of his own daughter in temporary marriage? I would say yes! Other than because they already do in a normal marriage, there are good reasons to do that in temporary marriage.
Let's say a father has a daughter who if not married will commit the sin of fornication, but no one has come forward to ask her hand in long term marriage - whatever the reasons maybe. Would he give her to some known pious person who ask in temporary (if it is proved to be the Sunnah of the Prophet), or would he risk her committing fornication. I am sure many can think of other circumstances.
This does not even address the issue from the man's perspective - students in foreign countries who do NOT wish to marry permanently from People of the Book (Ahlul Kitab); the possibility of turning the foreign wife to a Muslim and Da'wa (call to Islam) to her family, etc. Do you think "Christian" parents mind? I think not!
Even about Muslim countries I should say: Although Islam intends to revolve the culture of people, as a result of tendencies and ignorance in many countries dominated by Muslims, the culture affected the Islamic teachings, while it is supposed to be the other way around. One should be able to discriminate between the true teachings of a divine religion like Islam, and a culture.
About marriage in general, many Muslim families still have major "traditional" and cultural problems in marrying their daughters, for all kinds of seemingly stupid reasons. Yet, we do not blame the religion for such old tribal mentality and the shortcomings of the followers of Islam. Such feelings are all as a result of our cruel cultural traditions and not the true sense of normal feeling and pure instinct.