we do same task in signature but diff stake are rewarded

[Moiyah]

You have to realized within yourselves that, yes you have the same efforts, same post counts but you don't have the same rank in the forum. Unfortunately,  your current rank is jr. Member that is why the lower the rank is, the lesser stakes will receive. It isn't unfair 'coz the higher ranks stayed longer, probably have experiences in the forum than the lower ranks.

[ropyu1978]

jr member 1stake
member 3stake
hero 10 stake. but will perform the same task in signature
can someone explain to me the reason for this

of course this becomes a very relevant comparison. you are a beginner, and your account has just been registered a few months ago. whereas we to raise the rankings takes a full year so to the hero. especially in the field of knowledge and experience is very much different.
hopefully you understand this difference.

[mbah]

make an account so it has a higher rank takes more time and more experience than rank. has you thinking about it? reasonable only if it brings about different stakes because the capacity and quality of belonging is also different. If the more experienced and the new one has paid for the same so it's called unfair.

[jinxcreedy]

jr member 1stake
member 3stake
hero 10 stake. but will perform the same task in signature
can someone explain to me the reason for this

Angry or vex about it?  Try to climb up your rank. If it's not so how many people will contribute meaningful post on the forum now?  Very few