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.
Of course not all altcoins might go bust, but the focus is on bitcoin. You could avoid the 10% uncapped altcoins fee by simply depositing bitcoin. I know tx fees are high, but still you can send btc at lower fee.
You can refer to a site like
https://bitcoinfees.net/ or
https://bitcoinfees.earn.com/ to see how much you could pay in fees to moev your btc. You could sae 60% in fees or more if you choose a lower fee and are using segwit addresses (bc1). Though, deposit times may increase, you can always deposit btc at a lower fee.