Latency question (worlds of warcraft) - time of the month

I got Iburst (can’t get adsl/isdn in my area) mainly use it to play Worlds of Warcraft.
In the 1st 2 weeks of the month pings were great – 500 to 1000ms. I have vpn account when Iburst international gets slow.

Since Sunday my ping has been horrible – 3000 to 5000, does not matter if I use vpn or iburst’s international bandwidth. But D/l’s and sites still come down fast.

So I did a test this morning woke up at 5:30 logged into wow and played and got 500 to 800 ping, stable switched to Quake 3 stable ping of 70 no packet loss which I get at night.

So my theory is that most guys are capped, and are leeching slowly at 64kb for the rest of month, eating up timeslots on the tower, resulting in the higher unstable ping.

Or Iburst is shaping the vpn and wow protocols.

I am not capped still 300 megs left.

What are your guy’s views on this?

I've found some days it perfect other days it crap.
I normally check the latency then decide to play.
Last night I played RON with a mate overseas and it wasn't bad, but not flawless.
Last weekend it worked perfectly.
I tend to blame Saix, as they sell the international access and normally I look at the saix notices before I blame UUNET or WBS.
Two days ago a landslide killed on of the international links for a day or two. So that will screw up latencies.

It is only in South Africa where international pings of 500 - 1000ms are considered great...

Why don't you guys play on the local servers rather???? There are a few under the ground somewhere....

You can't compare a local hacked server running what a 100 guys against a us server with 8000 guys on it, the massive world in sa must look very empty.

Borrow account from somebody and see the difference.