Some of us canīt afford to spend loads of time in AWS because of work and when
And some of us don't earn (enough) money to afford a BMW or Mercedes, so I think they should present cars to those people.
If your strategy includes usage of a most wanted fleet group, you shouldn't be surprised when you don't get every aircraft you want. And time is no guarantee to get more aircraft. Yesterday was the first day I had time to F5 massively in Modern Times #5 and in fact I got less 757 than the previous days where I had to use the used market 2-3 times a day with my smartphone...
So when you want a guarantee to get aircraft you want, order them new or focus on a fleet group that isn't this popular.