Watch the actual volume numbers on coinmarketcap, and you will see that Ripple's daily volume is nearly always in the top 10 and frequently in the top five. That hardly counts as "barely anyone." In addition, the XRP volume number does not count the non-XRP to non-XRP asset trades that occur on Ripple, so a lot of activity is missed by it.
Litecoin does indeed have a bigger volume than Ripple, but the multiplier from Ripple volume to Litecoin volume is typically much smaller than the multiplier between Litecoin volume and Bitcoin volume. If you use the multiplier to discount Ripple, you are doing Litecoin an even bigger disservice with regard to the same thing versus Bitcoin.