Now many exchanges have a high-speed interface and do not have lags and failures. However, they have small daily trading volumes. To attract traders a little just a well-functioning exchange interface.
You are right, but promptly working functionality should not be discounted. Because at the time of active trading, a trader can lose money if the functionality hangs. Also, the daily trading volume depends on the percentage of commission that charges service for each trade transaction.
So that this was not, the platform should work without any failures, because people can simply lose their money