There are some reason which frequently impact the decision of trading using VPS, first of all it's more about better connection, absence of lags and freezes if you have a rather poor pc/laptop. Additionally, such things as slippages and requotes annoy you rarely. Increased security is another crucial thing for a trader, of course that is why he prefers trading using virtual private server. What else... Guys who are keen on algotrading frequently choose VPS, too.
Yes, I use a VPS for my trading. The primary reason is to ensure uninterrupted connectivity to the trading platform.