I've had even worse. We wanted to buy a product and couldn't do so on our own, so I left my contact information on their "speak to a sales person" form.
No response for a week. So I emailed an email address that was included in the onboarding email.
No response for another week. So I sent their CEO a message on LinkedIn. Hey, I really want to buy, let's talk.
No response for another week (and four months later). So I gave up.
For B2B, there are often close relationships with client interests. If a small firm signs a non-compete and NDA with a competitor, it can cost a lot more than a single sale to chat.
Also, in niche industries everyone already knows one another for decades. People looking to fragment that market are seen as a problem even if they don't know they are a problem.
It is rude to "ghost" people, but it is unfortunately a modern pop-culture trend. Most competent firms should at minimum refer your team to a competitor if their schedule is full for the year. =3