[Animats]

Right. Arbitrage on small differences works only if you can get quick execution, before the difference disappears. If the site gives favorable execution to some customers, as Mt. Gox did, it's hopeless.

[kbody]

Hanlon's razor though. I would presume malice only maybe to Bitmex, but for most other exchanges, I think it's plainly low-quality/bad engineering.

[kgc]

Why Bitmex?