No problem - just what came to mind when looking at it. For any things you do consider changing, be sure you are keeping good track of the relevant statistics to help you know what is working and what isn't.
I don't think $1 a month is too high; I think the main difficulty will be just getting the consumer to overcome the mental friction inherit in any online purchase, especially subscription purchases. You're going to have to convince people it's worth getting their wallet out for in the first place, and after that I would guess you could price it anywhere between $1 and $10 and it wouldn't drastically change how many people convert. That's at least given the current state of the product - if you can demonstrate more value, then you may have an easier time convincing people to spend their money on it.
I still think your best bet is to offer a free plan to small userbases, and then charge them once they grow beyond a given size. You could reassure them that they won't lose their images or have their account held hostage if they don't upgrade, it will just be frozen at the max limit of user icons. I would also offer 2 upgrade plans: a basic plan which includes 1 or 2 styles/sizes of icon, and a premium plan with all the customization options. The goal of this would be to make the basic plan more attractive while allowing those who need to customize to do so. Another idea is to pin the free userbase option as a "startup" option, and sell it as a gesture of goodwill towards entrepreneurs vs. a free/paid plan.
I really don't know much about GAE, but do they have some way to sell this as a GAE-compatible plug-in to other App Engine users? That might be a good route to take if they do.
I don't think $1 a month is too high; I think the main difficulty will be just getting the consumer to overcome the mental friction inherit in any online purchase, especially subscription purchases. You're going to have to convince people it's worth getting their wallet out for in the first place, and after that I would guess you could price it anywhere between $1 and $10 and it wouldn't drastically change how many people convert. That's at least given the current state of the product - if you can demonstrate more value, then you may have an easier time convincing people to spend their money on it.
I still think your best bet is to offer a free plan to small userbases, and then charge them once they grow beyond a given size. You could reassure them that they won't lose their images or have their account held hostage if they don't upgrade, it will just be frozen at the max limit of user icons. I would also offer 2 upgrade plans: a basic plan which includes 1 or 2 styles/sizes of icon, and a premium plan with all the customization options. The goal of this would be to make the basic plan more attractive while allowing those who need to customize to do so. Another idea is to pin the free userbase option as a "startup" option, and sell it as a gesture of goodwill towards entrepreneurs vs. a free/paid plan.
I really don't know much about GAE, but do they have some way to sell this as a GAE-compatible plug-in to other App Engine users? That might be a good route to take if they do.