I don't think it's about having a conversation or it being quicker, and to me it just seems weird and a waste of time.
If you want to have a conversation, there's no shortage of 'conversational' threads on here about life, the universe and everything else. So start or join one of those.
It's almost like people ask a question and don't care whether the answer is correct or not. What usually happens is that someone asks a really vague question where having the correct answer is quite important, in that, if they act on the wrong answer, it's likely to cost them money or inconvenience at least. Then they get half a dozen wrong answers, say thanks, and ignore the one correct answer.
Thread goes something like:
OP - going on holiday, what's my luggage allowance?
Poster 1 gives the answer for British Airways as it applied in 1985 where you could take the sofa and they would have let you on with it.
Poster 2 says 'we went on Ryanair and even my handbag was too big, they took it off me, charged me £57 to put it in the hold, stole all my holiday cash and DD was ill on the flight because her medication was in my handbag'
Poster 3 says 'which airline and what have you paid for' to which the OP gets all stroppy about only asking a simple question and not expecting an interrogation, but it's Easyjet if you must know.
Poster 4 says 'look on the Easyjet website' and gives the link to the luggage allowance page.
The OP then says 'I'm not clicking on random links, I thought someone could just answer a simple question for me' and flounces off.
And yet that's better than just googling 
.