On a 50:1 leverage, that $1000 would be the margin cost to put in a $5/pip trade. (basing that on the accounts I've had previously - $20 in margin cost per .10/pip of value)
So, you would need $2000 in that account to trade which $5/pip trade. Without a stop loss, your commerce would have 400 pips of room to proceed before your account is in issue.
...I sure would not have exchanged the JPY this past week like this...
Trading traditionally (IE - the way most brokers endorse and instruct ) I sure would not trade without a stop loss.