I've bought 4 things recently for Christmas, plus some insurance, which happened to need anyway and deliberately bought off 4 different merchants.
The insurance produced a click but no sale, which was no surprise as the merchants buttons were playing up and after going back and forth a couple of times I assumed it wouldn't track properly (
am I a realist or a pessimist ?)
2 out of the other sales didn't track.
Wouldn't it be nice to have some sort of 'last tested' date by each merchant as a quality mark ? The stats are all very well, but we've found conversions vary hugely depending on what the publishing site promotes. We've had 'good stats' converters do little and 'bad stats' converters do well. Knowing the tracking was working recently (all of it not just the banners) would give great confidence.
It would be nice to know that the merchants/networks carry out regular tests, with publicly known dates and frequencies.
Or could we (affs) have our own set of test transactions - that would be better.
We can test our Worldpay payment system easily enough with a dummy transaction.
That way we could do the networks work for them
I know for a fact that tracking can go AWOL for months without being noticed.