You use 1x for bitcoin or less than 1x by not using all the $500 to trade at once. Let us say just $150 for altcoins.
What percentage of interest do you think would be good for you to close the position?
I think Arthur Hayes, the CEO of Bitmex, said that although they have 100x leverage, most traders actually only used like 10x or 12x or something like that.
Most traders use 10x leverage due to counterparty risk. Say they have $1,000,000 in capital, they rather just deposit $100,000 to the exchange and use 10x leverage and just deposit/withdraw as the trade moves against/towards profit and they only can lose $100K if the exchange goes bust.
I think this is the real reason why people use leverage, mostly to counter any risks of the exchange going insolvent.