Run the MonkeyLab tests from the commandline: http://www.cloudmonkeymobile.com/monkeytalk-documentation/monkeytalk-faq#1.13
If you are a able to run a single test from the command line then wrap it around a bash script that loops 500 times.
Example bash script:
while [ $COUNTER -lt 500 ]; do
java -jar monkeytalk-runner.jar -agent ...
According to the MonkeyTalk website currently they do support HTML reporting.
From the feature list:
HTML, XML, xUnit reporting for tests and suites
MonkeyTalk provides detailed and summary reporting, with screenshots
that let you zero in on test failures. Reports come ready-to-view in
HTML with complete, step-by-step detail. MonkeyTalk's ...