You guys have to work it out and I do think provide a even thorough statement about the site :

How it would work?
Why is it a better option?
Is it safe?
Is it fair ?

Things like that , because there are numerous sites out here therefore you have to make yours stand out !

At the same time provide users with more options ; XRP is a hit how a days due to its low fee ; take care of the fee payment since now due to increasing price of Bitcoins the withdrawal fee is sky rocking and people are unwilling. Maybe you can provide them with a more sustainable and stable option ?

This would not only attract more customers but at the same time it would be a positive point for your site.