Wait let me get this straight, you can get miles by actually flying? Humm, that is a strange way to do it indeed.

OK look on FT for the best CC offers. DO NOT just check out the airline's website, as they rarely have the biggest bonus offers. While I don't know which airline you would prefer, American Airlines rarely has it's $30K bonus offer on its own website. Jump on super rare offers, like the British Airways $100K offer. Sorry that one is no longer available. While the hayday of churning is sadly over, sign up for different products, i.e. United's three cards. Just do not do it all at once, and maybe have a few months in between. Such as 3-6 months.

Also sign up for the personal and then the business Starwood AmEx. With normal spending and $K/month travelers check, I doubled up with their 15K bonus with $15K spending in the first six months. That got me 5 free nights in Vienna during my honeymoon, worth about $1K.

Good luck with your addictive habit.