Partly this is because we're so niche still that there just there just isn't a huge audience of developers to write large programs in WL yet, barring exceptions like [0]. I have no doubt that HN readers could do some amazing things in WL if they invested a modest amount of time in learning it.
I got sick of trying to get a price out of them for calls to their API. Not having a 'pricing' tab puts people off from the get-go and dealing with their sales people is a drag: all that technology and they can't even formulate a pricing calculator?!?
Cloud laboratory is so cool. I've also thought you could launch some amazing startups off the back of Wolfram Alpha language. But yeah quite a steep learning curve
[0] Emerald Therapeutics: http://emeraldcloudlab.com/