I've arranged tours for groups of up to 9 people. I won't do it again. Despite trying to involve everyone at the outset, and also making clear that I'd try to find accommodation that suited everyone but couldn't guarantee it, you inevitably become the 'go to' target for any sort of complaints. The accommodation is too noisy, the restaurant's too expensive, the restaurant's too cheap, why do all the restaurants close at 8 o'clock, why did you choose this town, it was much better when we went to XXXXX, the nearest petrol station is really expensive, where are we stopping for lunch today, do they do chips...
This year someone else made the arrangements and I just turned up to catch the tunnel, then turned up at the hotels. I was very careful not to complain about anything (and to be fair, there was not really much to complain about).
At least if you're paying a fair premium to have someone arrange your tour for you, you can expect full information at every stage and also have some moral (and legal) justification for complaints.
I see it as the equivalent of using a travel agent for your week in Greece; with a bit of effort you can get all the info you need on all stages of the holiday, and might even enjoy it if you're that kind of person. But if you're not, there's nothing wrong with using someone or a company that does it for you. It's no different to people who will say "You paid HOW much?" for new brake pads, or to have your house painted, or a new tap fitted in your bathroom.