For me it's procrastination and struggling to be inspired!
I don't mind travelling for rehearsals/ writing sessions but it needs to be for a decent amount of time.
In the band I was trying to put together we could only get together for 2 hours once a week which sucked. The other members had too many other commitments (other bands). For me a good rehearsal is 4hours plus and a writing session is a full day event; if the material is worth it!
Personally the writing sessions go together with the rehearsals, basically people who write with, play with too! All have the same level of commitment to the songs!
Maybe I was just lucky while living in England with the bands I was in there.
Looking for a bassist/ drummer and keys player now to start up again
Anyway, more coffee is needed!