No it does not mean 1 coin per stake , it can be much more than 1 coin or less too .
stake is awarded to make procedure simple to calculate tokens in end , bcoz awarding stakes is easier than awarding fixed amount of tokens .
for example -
you joined twitter bounty with 1m tokens budget , there are 1000 participants with different profile like
some members have 500+ followers - 2 stake per week, few have 5000+ followers - 5 stake per week
at the end of campaign suppose total stakes are 100k , then 1 stake value will be  = total number of token allocated / total number of stakes = token per stake .. in this case it will be = 1m / 100k = 10 tokens per stake .

so person with 500+ follower will get = 10 x stakes he earned in total , and person with 5k+ followers will get = 10 x stakes he earned .