It depends on whether or not they consume more as a result really - think about it, is the number of joules to transmit down a wire different at different speeds? I'd guess probably not
It wasn't that serious... and still need to process 10-100 gigabytes files for work sometimes, and am doing fine with my 50 Mbits... I just cannot imagine one person really.making good constant use of 2.5 Gbit, and in the rare times needed not just invest a little time, so I think it is money wasted in this case. Admitted, my imagination may be too limited and it is a valid tradeoff of time vs money.
But yes, nitpicking, but on the same tech it should be insignificantly more joules also, different techs or hw much more significant though.
For the sheer crazy joy of it!