GIVE UP COLLECTING THEM!
722 Rare cards in the WHOLE OF THE UK.
The McDonalds in my ASDA store I work at has thousands of customers per day.
Say for example there are 2000/3000 customers in a day, about 2 thirds buy a big mac or something with the promotion on. Thats 2000 people in one store (at the LEAST!)
2000 tickets in one store in a DAY, now times that by 1,115 (number of stores in UK).
2,230,000 get given away each day (MINIMUM!)
Meh.....it tastes nicer than a lottery ticket
Now the McDonalds promotion has been going for a while, but say for example you bought 1 mcdonalds in a week. Thats one chance in a week, where about 15,610,000 have been given away (MINIMUM!).
Also remember these winning tickets have been out for a while, chances are with that many being sold you'll never find one.
Better rewards from the lottery - Cheaper, more chances, healthier, BIGGER PRIZE!
(rant over)
Edit: More importantly you're just lining McDonalds pockets - Imagine 3000 customers per store, per day, spending an average of £3 each. Thats £9000 per day per store, x that by 1,115 = £10,035,000 per day roughly.