Ning is one prefect example. They gained lot of popularity with the freemium model but weren't able to cope up ultimately. Ning did get into the bad books of m

Ning is one prefect example. They gained lot of popularity with the freemium model but weren't able to cope up ultimately. Ning did get into the bad books of many when they pulled the plug and asked all existing customers to either pay or leave. Adding to what someone pointed out, the value depends on cost involved per free user and also if it is worth it in the long run.