Simple: I've been looking, but cannot find any specific rules on maximum margin based on account size (for OANDA). The only thing I see is: "Margin-trading - up to 2% (or 50:1 leverage)"
Is that 50:1 maximum the same for any account size, whether it's $1,000 or $1,000,000 ?
Just sounds dangerous to be offering such a high margin for just any old cheapie account.