My own answers:

Do you autocross?
Yep!

How often?
1-2x per month.

How far will you travel?
Up to 60-90 minutes.

How much will you pay to enter?
$15-20, more if lunch is included or for something special.

Serious competition or just fun?
Casual competition among friends, mostly fun and self-improvement.

Anything other comments?
Did I write that question? English really is my first (only) language.