When they were introduced by adult.com and then by other companies, many webmasters were shocked. Now the $10 per month sites are still here, but on the other hand, they haven't caused a massive exodus from the previous billing model ( cheap trial / expensive monthy membership ) preffered by most big sponsor programs.
It would be interesting to hear if they really retaing far better, since this was apparently the main idea behind them.
Anyone knows
