Same here. My company uses ruby (on rails) and golang and ruby is by far the language that gives me the most joy. One of our projects has reached a size where I really wish ruby had a built-in type system but other than that it is a really great language and by all means it is fast enough for most use cases.
Is it though? Considering the amount of time you spent in it and the potential productivity increase it might give you I’d consider it very fairly priced.