.. is that hitting them doesn't mean you stay in front of them.
In fact, my experience so far has been that hitting milestones is often followed by a massive cooler (as BCG will attest), or a heater that causes you to hit the *next* milestone before you know it.
In my case, it was the former. I had a crazy swinging session yesterday, where I ranged from being $200 up to being nearly $800 down (5/10 and 3/6 Euro will do that to you). Luckily I managed to finish ok and am now just $150 down from my $10k milestone, and with a chunky bit of rakeback to come.