WordPress MU

I have noticed that lately any time I add a category or a tag through the admin, it ends up with a nutty, exponentially larger term_id in $wpdb->terms, like so:

|      48 |
|      49 |
|      50 |
|      51 |
|      52 |
|     847 |
|    3797 |
|    5678 |
|    9063 |
|   11852 |
|   12200 |
|   14519 |
|   14797 |
|   18097 |
|   19058 |
|   20353 |
|   22471 |
|   23128 |

The jump to a 5 and soon 6 digit ID is happening a little too quickly for comfort. Curious as to why this was happening, i tracked the code to the function "wp_insert_term" in the file "wp-includes/taxonomy.php". The cause seems to be lines 942-944:

$maxterm = $wpdb->get_var( "SELECT max(term_id) FROM {$wpdb->terms}" );
$term_id = mt_rand( $maxterm+100, $maxterm+4000 );
$wpdb->query("INSERT INTO $wpdb->terms (term_id, name, slug, term_group) VALUES ('$term_id', '$name', '$slug', '$term_group')");

Why is it that a crazy number has to be generated for the insert instead of just incrementing?

I changed:

$maxterm = $wpdb->get_var( "SELECT max(term_id) FROM {$wpdb->terms}" );
$term_id = mt_rand( $maxterm+100, $maxterm+4000 );

to

$maxterm = $wpdb->get_var( "SELECT max(term_id) FROM {$wpdb->terms}" );
$term_id = ++$maxterm;

So that the increment works as expected, is there any reason not to do this, will it screw up anything else?