You would, unless you're well enough off that you wouldn't have to sell a house to buy a boat.
A decent one will set you back over £100k which is just the start of a pretty expensive way to live.
Hiring one for a couple weeks is definitely the way to go.
I like the look of a widebeam Dutch barge, some of them look like they've got the floor space of a bungalow, and cost nearly as much.
If I hired one for a holiday I'd definitely get a skewed idea of what life was like as I'd plan my route around the canal side pubs. 🍻😊