OK, here goes :-

1. I learnt about the BA Amex 2-4-1 deal which got me 2 1st class flights London - Shanghai for the cost of redeaming miles for 1 flight. Each flight would have cost $8000, so I got $8000 of extra value. This was a flight I had to do for personal reasons, although I would normally have flown C not F but paid for it with cash.

2. I found a deal in mileage run using expedia to get a 1st class flight LHR - JFK for $800. I guess this was about $2000 below market value. This was a flight I had to do for personal reasons, although I would normally have flown C not F but paid for it with cash. This also got me AA Plat on a Challenge, which I wouldn't have known about otherwise.

3. I have used the Starwood stay 4 nights get 2 free a few times, usually in higher costing European and NYC. This has probably saved me at least $3000.

4. The BA Amex card has gained me about 200,000 BA miles I would not have otherwise got. This is equivalent to 2 Transatlantic flights in C ( or 4 using the 2-4-1 voucher) but assuming just 2 this is $6000 of extra value which I have not yet used.

5. I have found quite a few Starwood bonus promotions that I would not have known about otherwise, which has gained me about 50,000 extra Starpoints. This is worth at least $3000 to me.

Actually there are quite a few more small promo's I have found out about on AA, Hilton, Marriott, Tesco (i.e. BA) and SPG, but individually these are pretty small. Cumulatively they might amount to $2-$3k of benefit, but this is very very approx.