How did you find out?

Hover over the username, and look at the status bar.

Woaahh its like magic!!

No, it's like the system.

So the bluegoop crash, and the deleting members thing didnt mess up the order?

No, because it was already set to you. I presume that if you go through every number, so may mess up or something. Because I remember being 182 when I first registered, so I haven't changed.

But remember when i think i got deleted from the database and i had to register again at November of last year, cause before i remember i registered in August.

I believe every registration on a vbulletin message board has a different userid.

Say userid # 5 was deleted, the 5th person who registered, and the ID of the newest member now is at 20. The next person who registers will get userid #21, 5 will just never be used again.

Of course those numbers have nothing to do with Bluegoop's board stats.

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okay so if i get deleted when i was member number 1200, for instance, and then i joined 2 months later when inbetween that period, 20 people have joined, my number would be at 1200 ? or 1221?

You would be 1221. As Alias was saying, if you get deleted, it pretends as if the number is still in use, so it doesn't get reused.