survey v.s. PPI

since i couldnt get an answer at the CPA forum, so i try it here.

my question is regarding incentive CPA offers - difference between survey and PPI.
so here is my understanding now. PPI pays less and it's easier because it takes users less time?

I have gone through a survey and it's almost impossible to complete. it's never ending questions, one after another. by the time i am 30/100, i already feel like a fool. so my question is: what makes people actually complete a survey?

When both PPI and survey are incentive offers. do surveys need different kind of incentives? they need to be done differently? reason i ask is because the same incentive works for PPI, but i cannot get a conversion on a survey?

PPI pays a bit less than surveys but its worth it since it converts wayyyyy more.

I haven't done PPI in over a year so it might be different now and since google is cracking down on it. Now the user has to download a zip file then the PPI file which hurts the conversion.

You actually get paid after the user complete the first survey but the network keeps feeding the user more surveys so they get more money. You don't get any money from these extra surveys.

i actually tried a survey from cpagrip. i must have gone through like 8 pages, including my name/addr/phone/email/dob and i believe well into 2nd or even 3rd survey. YET it still didnt count as a conversion. or is there a better cpa network than cpagrid in terms of incentive surveys?

do you think surveys are harder because of the time commitment? why do the same incentives not work for surveys?

Survey - desktop traffic
Installs - mobile traffic

Any legitimate surveys at all? I've heard a lot about people having success with them over the years, but never seen clear mentions to the networks or programs they're using.

Txholdem, I had the same experience, I wanted to check out how would the first survey be like, never got past that. Frustrating, especially if you only have one or two CPA networks.