I have been on 6mWSPR (1W ERP) most of the day, in addition to being on 10m WSPR (500mW), Still, after days and days of trying on 6m I have spotted no-one and been spotted by no-one at all.
UPDATE 2050z: I shall stay on 6m overnight, but think I'll be wasting my time!
UPDATE 2244z: Apparently I am set to the wrong frequency on 6m by some 400Hz (checked by G0LRD) despite using a 0.5ppm TCXO and using the same offset as for 28MHz, which puts me pretty spot on. I'll QSY in the morning. Lack of activity and frequency error are my issues. I am puzzled by the frequency error. In the meantime, you will spot me if set to 50.292600 and not 50.230000MHz