Would you like an in-game parser?

[Deithwen]

The gap widening isn't solely "bad" players.

Ping/latency is a real issue. if you're losing 10-15% dps at around 200ms and the "best" is 1000dps, then you'll prob do 850-900 max. Not such a huge gap.
move onto SB, when the dps is 5000+ now you're losing 500-750dps, and that's HUGE.

this is actually one of the main reasons I don't ever expect to see a parser, as much as I'd like one. It would make the problem far too obvious.

I agree that latency can be a problem, though I doubt it would be a 10% dps loss, unless you're clipping every GCD or have packets loss.
It may affect the DPS to some extent, but I don't think I can be used to justify the DPS gap we currently between a good player and the average dps in a 24 man raid for instance.