How much you make is completly dependent on how much time and effort you put into it.

There are a lot of ways to make money aside from just filling out surveys on these websites, and really it's up to you to take advantage of them. For example:

- You can fill out just one survey a day, or you can fill out as many as are offered to you.

- You can refer other people to earn a percentage of what they make.

- You can click the free paid emails from inbox dollars.

..and so on, and so on. 

Is it possible to earn a lot of money? It really depends on what you consider 'a lot of money.'  Through simply filling out surveys, if you sign up to all of those which I've listed and actively fill out and qualify for every survey you receive, you can make anywhere from a thousand to four thousand dollars, depending on the number of surveys you receive in a years time and how much each pays. 

I made 2,000$ in just a year, which honestly isn't that much money, but it's a nice bonus to my regular pay.   On average most people will only earn about 1,000 extra dollars a year IF they put a lot of time into it.  If however you are very dedicated and know how to use the referral system cleverly you can potentially earn 5,000$ a year - but don't expect to do so - it takes a lot of work and requires thousands of referrals to be done.  

A user I talked to onCash Crate was kind enough to share his referral statistics with me, and I was shocked to find out that he had 9,000 referrals, and was making nearly 10,000$ a year off referrals alone.  Not much if you're going to consider it a salary to live off of, specifically considering the sheer amount of work it takes to keep thosuands of active referrals in your account. 

Only 1 in every 100 users (which is an arbitrary statistic for example purposes only) will end up being active, and even then chances are they'll give up in a year or so. 

Don't let that discourage you, just don't think of it as a get rich quick scheme. It won't get you rich and it won't be quick, but it can be done. I have yet to see that kind of financial success, but it gives me hope to think if I work at it I may be able to make that much too.