Sincere question, is it common for young startups to gobble up that many domains?

I don't know how common it is, but it's certainly plausible. My startup has over 50 domains and we're actively using 10 or 12 of them. Buying domains was one of the largest early expenses. It's important for each of our products to stand on its own; using subdomains is not an option from a marketing perspective.