Lifetime Licenses

Hi,
I only upgrade software when I can buy a lifetime license.
The issue is I am a developer and I do not maintain websites.
I build them to last forever then I move on to the next project.
Please can you guys look at offering a lifetime license for unlimited websites.
I really like what your tool offers and I would like to continue using it and support your company. But if you guys start with upgrade popups or coloured banners in your plugin I will find a new tool.
I like what you guys have created. So please create a lifetime plan for developers such as myself and for agencies as well.
Alternatively allow us to buy a once off license for 5 or 10 dollars per website.
Something affordable per website or something ridiculous for lifetime access to unlimited licenses.

Regards,
GB