It's an interesting problem - the issue is that our trials are both money & time based ($300 for 60 days). So technically you've "used" your trial even if you do nothing for 2 months.
We do appreciate the feedback and are looking hard at the right next way to solve this. If it wasn't for bitcoin miners and/or bot nets, this would all be a lot easier :(
Ah, interesting -- I thought it was for a year. Then I don't feel like I'm missing out quite so much, because I would have a hard time spending that much credit in 2 months anyway :)
1. Current type for new customers. Here's $500. Do whatever you want
2. For old customers who haven't ever used a free trial, give credit without limits (same as new customers)
3. For old customers who have used a free trial give credit only for services they haven't used