If you want the pool to be more successful, you should advise a price where mining with oclvanityminer is clearly more profitable than both BTC or LTC mining and make it clear to customers than below this price there's not much incentive for anyone to work for the reward.
At the moment the minimum fee is a fraction of the honest fee. The reason I did this was because a lot of addresses can be mined in parallel if they share the same public key (if one person orders a lot of vanity addresses simultaneously - this has happened before). This approach allows for people that want one or a hundred vanity addresses to be able to adjust their price accordingly. On the other hand, people that just want to be cheap will have their work sitting there forever. If I raise the minimum fee, this will hurt the bulk buyers, so I'd rather leave it to supply and demand. I guess I might start prompting people that have heavily underpaid works on the pool to send in a bit more money to get things moving.