BTCEXA adds XRP/BTC pair. Why not BTC/XRP?

BTCEXA, an exchanged based in Australia that offers XRP/USDT trading along with 4 XRP based pairs (ADA, SHEEP, XLM and TRX) has added XRP/BTC pair.

BTCEXA made XRP a base currency on December 24th (along with two other exchanges on that day, Binance and CoinDCX).

One would expect that BTCEXA would take it to “the next level” by adding BTC and ETH XRP based pairs.