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.
Most of the problems I find with the site are purely UI ones.
I think the details of how to profit from multiple works sharing the same public key are obscure for most. I understand the principle and could compute a fee profitable for miners but honestly I can't bother. Until now I never purchased anything because of that.
Each time I come to the site I have to look around to find out how to generate the data needed for a request too (there's not even a link on the request page): this doesn't help.
Multiple works aren't so easy to setup if you want to get a result for all of them: when some are found, the rest becomes less profitable to mine and miners eventually stop working on them. So a potential customer will certainly have to add to the original rewards possibly multiple times: this should be explained and made easy.
I'm not even sure that you can withdraw a request and get back your reward. This is not helping gaining customers: if I pay for a vanity address and find out later that it will never be found unless I pay much more did I lose my original payment for nothing if I can't/won't pay more?