Well I did it on my t440p and I didn't find it entirely trivial including the risk that you may brick the motherboard and that the Laptops sold over their are additionally refurbished if I understood correctly … So £130 is not too much in my opinion. Obviously it is on the high side because low volume and support for free software ·
If you have nothing else to do. Then your own time is worthless and I would agree with you. If you have family and ir a job, your time is the most valuable asset. 130 pounds seems reasonable for not having to do this one off flash procedure.
As you also have to reflash the system bios to libreboot. That is the crux here.