I think that the minimum deposit depends on the number of clients of the broker. If a broker has many clients, he does not need large deposits to cover his expectations of earnings through the spread. It is for this reason that instaforex has a minimum deposit of only 1 dollar, which is available to anyone. More traders means more server problems, because you need more better servers and things like this. I've noticed this with fast growing brokers.i think that some brokers just offer standard account and also they have some rules and they cannot open cents account or even less than that