You can request any daily limit you want. My daily limit is 20,000 BTC. It used to be 100 BTC. What I did was simple. I sent an email in
info@mtgox.com and requested to new amount. Done!
When was that? We've emailed them five times over the last month, and sent government-issued photo ID twice, to increase our BTC withdrawal limit. They've completely ignored us. And we're a company that has deposited tens of thousands of USD into MtGox.