I'm in the same boat as the GP, and while I'm clearly also not the customer, that's not necessarily reflective of how much money is being forgone by missing out on my business. Oh well, their loss and the competition's gain.
In-person sales work at least in part because salesbros are trained to handle and overcome objections. They do it in many ways, and most of those ways take advantage of the fact that people by and large tend to want to act agreeable and kind to each other kind of by default. If you opt for the in-person meeting, the salesbro knows they have the opportunity to guilt or nudge or suggest you into buying additional services, or a longer service agreement, or a higher SLA, or whatever.
So, OP isn't the customer because they're announcing they're not interested in the dance. Many (not all!) IT vendors prefer the dance because it makes more money.
I say this as a former presales engineer for EMC (before it was EMC/DELL), serving large enterprise named accounts in the Houston area. If my boss saw me in the office, he'd kick me out and tell me I should be out taking clients out to lunch or to Astros games or whatever. I spent probably $2-3k/week on entertainment, and it was basically imaginary money to EMC, because if me and my salesbro blew $20-30k hooking a client, we were going to be doing it on a $2-3 million Symmetrix deal with 70-80% margin.
So yeah. OP isn't a customer because they don't want to play, and (most, not all!) companies can extract more revenue out of customers who DO play.
Not every business wants every customer. Some businesses know they can do very well if they keep their costs-per-customer low and their revenue-per-customer high, even if they have to have fewer customers to do it.
Some of those "contact us" companies are in that situation. I think that most of them aren't, but wish they were.
So they forego customers that just want to pay $N amount of money to try&use their software/service in favor of customers that want touchy-feely phone support at every step?
In particular I find that Chinese companies are hungry for all business, more willing to provide up-front information, and more willing to send a direct quote no-questions-asked rather than scheduling a meeting with a sales rep. I'm not surprised when I see them win.
You are not the customer because you are not who is being targeted by the website. You don't have the ability to pay X thousand a year as an individual or even as a corporate spender, there are specific people in companies that buy software, and those are who these websites target. It is nothing personal, it's just that you are not the customer, no more than if you go to a ski resort and want to surf instead, asking why you can't surf at the ski resort.