Say I'm company X, and I develop a custom Wordpress theme, then I can remotely update my theme using Kernl?
If that's a yes - I think I dare say you're undercharging by a factor of 40.
If I pay $50 for a wordpress theme (as a user), I'm probably getting a grand or two worth of value. That's why some themes are able to sell 200k units at $50. In your pricing structure, that'd be 1 theme? Currently, it seems that a company that made $10m in gross revenue from their theme is able to pay just $5 a month.
Wouldn't it make sense to split pricing up between a theme or a plugin? Plugins are usually niche, lower priced and lower value. Themes are generally higher priced, and higher value. How about charging $200 or $500 per month for a theme, and $50-100 for a plugin? Clean and simple.
If I'm a WP company, there's no way I can roll that out for < $200 a month in a reliable way.
Forget VC - find 50 customers at $200 and take it from there :)