It's a shame they couldn't explain how the credits were going to be allocated at the time they announced the upcoming wipe, rather than leaving it until the day before to let people know - There's probably quite a few players who missed out on "game time" during the time period due to either playing on the PTU instead of the PU, not playing because they were aware of the upcoming wipe and didn't want to invest time in something where the "reward" for their effort was going to be "taken away" not long after, taking a break due to a number of bugs in their preferred play area, etc.
That said, given there's likely to be another wipe inbound with 3.18, there's probably not much benefit to receiving extra credits for 3.17.2.