I'm not surprised. That's not a holiday, it's torture...
As for not many people asking for company... I'm not sure it's shyness, or wanting to be alone. I think there's a certain aspect of not wanting to get stuck with someone you find you don't get on with - especially for a longer trip. Most of us probably either are happy alone, or have people we know we get on with. Meeting up with forummers for a day (or night) ride is one thing, esp in a bigger group because you gravitate to the people you find you get on with. And even if you think you know someone from the forum, you might find them different in real life. As someone said above, a difference in pace, or talkativeness, or ability to cope with rain, can ruin a trip if it starts to grate.
With the organised tours, yes they are pricey, but they are run as a business, so there needs to be profit. But many people have the dosh, and like to have everything arranged for them
I can think of a few people on the forum I'd
expect to enjoy touring with - but I'll not be sure unless I ever actually do so....