I was a member for 4 1/2 years when they closed my account and forfeited the points I was about to redeem without explanation. It took three weeks, several emails, and one phone call to get a vague explanation. I was not alone in being targeted for this practice.
The reward currency they use is only 20% of real money or less, but from other reviews here, a lot of members do not understand that. I was able to get a small amount of real money from them by redeeming for US Bank Flex Points which can be redeemed at $50 from US Bank, but the limit of $20 per quarter meant that they were only a third or fourth rate survey option in the first place.
The way they close accounts without explanation is definitely a negative. If you spend your time with them, just keep in mind that they will eventually disappoint you too.
The BBB replied to me that they do not cover my issue unless they find a pattern of this behavior. If you had your account suddenly closed and lost value, file a complaint with the BBB right away. If a pattern can be established we just might get our just e-rewards.