why people do such?

Question

Some days ago I saw a very dumb question ( which language would be better for beginner? -1day ago ) and i wrote a whole 8 lines of comment to help him. But once i thought to check his profile. CAn't believe that guy was at Level 16 and has completed almost all the language course. Later on I saw such more question posted by such person who have completed most of courses and even replying the thank you comment.
Can someone explain it?

Answer 1

yes... that's seems probable...
earn badge means earn few xp, and xp are hunted at any price by most of sololearn users (unfortunatly ;P)

Answer 2

probably for badge hunt ^^

Answer 3

look at how many users starts a lot of courses at same time: did you think they do that for learning? ;)

Answer 4

seriously, Level 16 guy would post that question just for badge.

Answer 5

It's like theres no youtube or google to help u.