The goal is to hodl bitcoin in the long term, that's why we have such a low rake. Altcoins can go bust or stop being developed but bitcoin is here to stay. Now, there's a 10% fee if you want to deposit with altcoins, but the focus will be bitcoin.
10% fee to deposit with altcoins? Seriously? That's downright horrible. 2-3% withdrawal fees makes sense, but 10% deposit fees is crazy in my opinion.
Do you really think popular altcoins like LTC, XRP, Doge etc will go bust just like that even though their popularity continues to rise over time? I advise getting rid of the deposit fees and adding popular altcoins since BTC TX times and fees aren't exactly ideal these days.