Am I stupid??

Or missing something.
As you may have read, I have booked some of the BC recomended;) BA First Flights, but it means I need to start in lisbon.
In my never swerving geekness, I think I have just found another good loop hole....... unless I am stupid or have missed something.
With the flights starting in LIS you need to get there first, But if you buy a cheapy econ ticket to reach the start point you get little if any miles and waste half a ticket.
I have just reserved a D class, flexi buisness with BD for about 50% more than they were quoting an econ, and as it is flexy it seems I can get a refund on the unused portion which them makes it the same price as the economy but I earn Tier Points and Double Miles..... can it get any better or am I misssing something silly.
Need to confirm the flight by Monday so any insights appreciated?
Thanks
As you may have read, I have booked some of the BC recomended;) BA First Flights, but it means I need to start in lisbon.
In my never swerving geekness, I think I have just found another good loop hole....... unless I am stupid or have missed something.
With the flights starting in LIS you need to get there first, But if you buy a cheapy econ ticket to reach the start point you get little if any miles and waste half a ticket.
I have just reserved a D class, flexi buisness with BD for about 50% more than they were quoting an econ, and as it is flexy it seems I can get a refund on the unused portion which them makes it the same price as the economy but I earn Tier Points and Double Miles..... can it get any better or am I misssing something silly.
Need to confirm the flight by Monday so any insights appreciated?
Thanks