How so? It's less than $400 for an unlimited use single developer license without support. That doesn't seem very expensive for a good product that saves time and helps productivity. I'm sure they might offer discounts if you contact them about the startup situation.
It's 90$ for a single web page that's not considered a web application, which has a dubious definition "A web application is a website that has customer specific data or charges for its use."
Most tech startups probably aren't going to meet that definition. It looks like a 1-developer license for a typical SaaS offering is going to run you $390. Five developers is $1500.