they do it because they want to know people from somewhere else to be a friend with someone they did never met and perhapse talk to someone  who didn't already judge them .

some people do it as an adventure , and some times it gives you a good experience and maybe some lesson

well in my previous comment al-moutanabi (a poet) is making a figure of how much he is proud of what he is!!

so he said that even a blind man can look to his art and even a deaf man can heart his gorgeous word .

and to discribe how much his famous he munchen that the horses , night and the desert know him as well as does the sword, the spen, the paper and the pen in an others words he want to say that he's a great survivor , night, worior and poet 

أنـا الـذي نـظـر الأعمى إلـى أدبـــي

و أسـمـعـت كـلـمــاتي مـن به صـمـمُ

الـخـيل والـلـيـل والـبـيداء تـعـرفـنـــي

والـسـيــف والـرمـح والقـرطـاس والـقـلـمُ

ʾAnā l-ladhī naẓara l-ʾaʿmā ʾilā ʾadab-ī Wa-ʾasmaʿat kalimāt-ī man bi-hī ṣamamu
Al-ḫaylu wa-l-laylu wa-l-baydāʾu taʿrifu-nī Wa-s-saifu wa-r-rumḥu wa-l-qirṭāsu wa-l-qalamu.

I am the one whose literature can be seen (even) by the blind And whose words are heard (even) by the deaf.
The steed, the night and the desert all know me As do the sword, the spear, the paper and the pen.

thank you charlescuy i appreciate that :)