Hot charts with new html5 visualization engine (free)

(free) unless you want to use it in your SaaS (where SaaS = any website with paid accounts) in which case it's $5000. Ouch.

You should by all means charge for it, and if people want to pay $5000 for the SaaS license then definitely charge that much. But in my experience if you have a focus on graphing you're just going to outgrow these libraries, using them forever requires too many compromises while replacing them with your own or open source becomes increasingly viable. And if charts are just a supplement to your main focus there's a ton of free and foss alternatives out there.

Also it's a massive turnoff that you have to load the code from your website.

The branded version is free for all cases (even OEM), and you can download the JS if you want (although you won't get updates & bug fixes).