How is that different? The transaction data export from most crypto-exchanges takes up the same amount of clicks no matter if you have 5 or 5000 transactions, as do the adding of whatever formulas you might need in excel to manage your business - which is obviously the case if your trading volume is substantial; if you were doing a substantial trading volume in, say, collectible card game cards, you'd also have to have a custom accounting process for tracking the goods you're reselling and how they appreciate, and you'd obviously have to record every transaction just as if you're trading in physical goods.