Originally Posted by pstravels

Have heard of people do 8 figure spend, but there salary is also very high 6 figures.

In general, dont do more than your income on one card.

The most extreme MS I think you can get away with:

Taking avg household income at 50k, assuming average MS'er has just two go to MS cards at AMEX, CHASE, Barclay, CITI, Capital One, that would be 10 cards.

At most they are safely MSing 500k a year. Add in signup bonuses, easily earning above 1 million miles a year => Assume value of a mile greater than 1c if they are smart, say 1.5=>Maybe 15k profit if smart about it.

Pretty good for someone who only earns 50k a year.