I run a home lab and I rarely see any advantage between 2.5 and 10g. Not to say that there is none, seeing a large file transfer at 1gbps or more is fun, but the time savings vs the cost just isn't quite there for me yet.
My entire file library is only about 10 TB, and most of that is from ripped DVDs & blurays. My opportunities to transmit or receive more than a gig of data in a single transfer is extremely rare, so it makes little difference to me (and my assumption is by proxy, most users) that it could go ~4 times faster.
For actual business work, though, any lab I set up from the future on will be min-spec to 2.5gig and expected to run 10gig on at least any IT machine/vlan/subnet, whatever.
But for the home consumer, 2.5 is probably 10-50x their home internet connection and more than sufficient for normal daily use.
