The LTC trading volume on Polo is normally well under 100 BTC / day and LTC is the 2nd largest coin (the premined Ripple isn’t really a coin). MAID is currently the 4th Polo listing by volume (in BTC).
Seneca guesstimated the daily number of requests will be 1 billion, which would be a lot of trading.
At some point that might happen, but I think for the first 6 months the number of GETs per day will be orders of magnitude smaller.