The only reason Springboard didn’t rank higher on our list is because some users have reported a fairly limited supply of available surveys, making it difficult to reach the $50 minimum cashout threshold. However, the availability of surveys depends on your demographics — so my recommendation is to join, making sure your profile is 100% complete, and then see if enough opportunities come your way to make it worth your while.
They don’t give a reason for this, but I assume it has to do with taxes. You see, if you pay someone $600 in any given year, you are required by law to report that earning and send them a tax form at the end of the year. And since 60,000 equals to $600, I assume they have that rule in place so they don’t have to deal with all that paperwork come tax time.