They are earning a ton of profits from people trading on their platform and paying that around 0.2% fee per trade conducted. They couldn't care less about small players in the system that contribute next to nothing to their profits.
Yup. Actually, I did the math using their API. For their USDT_BTC pair alone they make over $26k per day, which is over $9 million a year. Add in all those other markets and yeah, I think they can afford to fix their server problems, they just don't care because it's the HFT whales who make them the most money anyway, and I'm sure they all have their servers colocated next to polo's servers, so lag isn't an issue for them.