You should be asking why they keep breaking. Why do you find it necessary to keep inserting and removing them? If you squeeze the tab properly when inserting or removing they shouldn't break. I've never had one break, but then I don't keep pushing them in and out all the time. The plastic material is usually flexible enough to stand up to a fair bit of use.
I use it to connect my laptop, which lives on my bed and bedroom floor, to my powerline adapter. This enables me to use the laptop for downloading and streaming media to my network media player.
Obviously with the laptop being a portable device, I take it out almost daily to use it around the house and take it to work. I've replaced the ethernet cable 2 or 3 times in the past few months and I don't really want to fork out for a crimping tool as I only want to use this one cable.
I know that but my laptop is 4 years old and has always been left there. If it does fail, it's insured and all my data is backed up so I'd rather live with the comfort of having my laptop where I want it.
You could just use a bit of wood or a tray with a hard surface to give it a chance of surviving, without loosing the convenience of where you want to use it. Just because its 4 years old doesn't mean you have to trash it. My wife is still using an Acer laptop that is almost 10 years old that has been treated properly. OK its not all singing and dancing compared with modern ones, but at the time it was top of the range and it suffices for the purposes she needs it for.
Even though you say you have everything backed up its still awfully inconvenient when your computer packs up and you have to spend a long time getting things back to how you like them. And as woodchip says insurance doesn't cover neglect and mistreatment, just hope you can afford a new one when the time comes!