Why aren't more people doing this?? I just bought 50 Tesla Roadsters on my business AMEX (no fixed limit) for $70,787.50 CAD per. $3,539,375 total. Normally, this amount would bankrupt me... But I have a plan. Let me explain: On my AMEX I have 50 days before interest starts occuring. Longer than the 30 days you normally get on a credit card. I will resell the cars for $72,000 each. Only a small difference so nobody will care. But the profit? $1,212.50 per car for a total of $60,625! And I'll pay back the credit card before any interest. I just made your annual salary in less than a month. There are levels to this.