Cost of Capital One Miles compared to the other options
In most cases it is best for Un-Bonused spend - the costs are against the best cash back option = BofA Visa with Platinum Honors = 2.625c
So lost cash = cost of a capital One mile is about 1.3-1.4c at most
Chase Usually gives 1point, but you can use an unlimited card 1.5x and transfer the points to card with perks and then transfer to partners - so I use 1.5 as base earn
Amex Usually gives 1point, but you can use a business card for 2x in small quantities and transfer the points to partners - but not unlimited - so 1.5x average max
Amex Often has transfer bonuses - eg 40% to BA, 25% to AF, 20% to AC; 25% to B9 etc etc
Citi Many cards 1x - but you can get a double cash - get 2 points then transfer to card with Premier rewards then transfer to partners - so I use 2x as base
Cap One Cards give 1-1.25-1.5-2x depends on annual fees
Avios BA, Iberia, Aer Lingus and Qatar now use Avios - can send back and forth - QR and BA integrated better;
Singapore much Better award availability with SQ miles
Overhead Cost = cost of all credit cards for airlines and banks = add annual fees less rebates / divide by 2M miles a yr
Most partners are best served by Citi and Cap One cards
Most Hotels you can buy points on sale better than using their card
AA AS UA Best to buy on sale - do not use the cards other than to get status OR benefits like free bags
DL - spend only for status never for the miles!