This was 25 years ago, but we rented and piloted our own boat on the Canal du Midi. It was my husband, my mother-in-law, and me on an English narrowboat, equipped with kitchen, dining space, sleeping room for at least 4, head, shower, and a diesel motor that never went too fast. Big boats flying Netherlands flags passed us regularly, sometimes leaving a wake (which you’re supposed to not do), but we weren’t there to set any speed records. The boat came with a couple of bicycles lashed onto the roof, but they had rusty chains and didn’t roll very smoothly, and a three minute attempt to ride alongside the canal convinced us that this was going to be a journey by water only, and not at all by bicycle.
As we picked up the boat at Narbonne, with local kids jumping into the canal right where our boat was moored, we were informed that there was a strike in effect by the lock workers, but that we could be operate them ourselves. That never became an issue; we never reached a lock at our casual pace, so going as far as Carcassone was never realized. One of the most memorable parts of the trip was hearing some bells, which got louder and louder. We then saw a sheep running along the side of the canal, with a bell clanging from its collar. Another sheep ran right behind it, and then another, and another. For 10 minutes, we were treated to a huge parade of running and galloping sheep, bells ringing the whole time.
I can’t begin to recall what it cost, but it was affordable, and we were even less well-off financially then, than we are today, and it wasn’t anywhere near tens of thousands of dollars. I’d thought that the company we used, Minervois Cruisers, had long-since ceased operations, but searching on them just now, it appears they’re still in business, going by Minervois Leisure as well as Minervois Cruisers, but apparently rent out a gîte, in addition to a narrowboat. A quick scan appears to show the weekly rate for the gîte, but I missed seeing any details about the boat.
If you want a barge cruise with an attentive crew, it sounds like you’ll pay for that. Yachts are yachts, even if they’re barges. But for do-it-yourself barging (narrowboating), here’s what I found - but again, I haven’t checked all the current details:
https://minervoiscruisers.com/media/canals_and_rivers/index.php