In case you choose > Option 2: Pay-as-you-go bundles ($3 for X answers, no expiration) add a ridicule expiration date, like 1 year. So you don't have complain

In case you choose > Option 2: Pay-as-you-go bundles ($3 for X answers, no expiration) add a ridicule expiration date, like 1 year. So you don't have complains in 10 years when you have to redesign your plans. Some people used a model that charge only the months the user use the service, It may be a good middle ground, but it's better to add a warning so people don't complain becuse they forgot that they registered the credit card 6 months ago. I think I prefer "X answers in 1 month", but I'm not sure my opinion is a good one.