OMG post stats when they get em, some are quick, some are slow,
this leaves you with only a couple of choices,
A) change a couple of links over so you aren't sending all your traffic,
B) use something like hypertracker.com and pop 2 urls in the field and it will cycle them so you get an even spread, 1 click to your existing merchant and 1 to omg's
C) slap the link up towards the end of a month and then revert back to your exisiting links till the stats are in.
not ideal but better than not trying them at all I suppose.
OMG are aware of the need for more detailed and up to date tracking of some kind, and have recently made a leap forward with the daily clicks etc so if the sales data was only daily, or worse weekly then that would give most of us a greater incentive to use / trial merchants with them.
Tyson's dragged them a long way forward in the last 18months/2years but he and they are aware they not there yet tracking wise
(ok that's me gonna get spanked off tyson now no doubt
)