Okay you can buy for 1.62 cpp but the thing is that you can get oneworld sapphire or emerald!
Okay for 10% of the miles pre bonus count towards status points. So for 400000 (pre bonus) miles you can get 40000 status points, enough for oneworld sapphire. So for $7290 (with bonus) you can get oneworld sapphire and we value Avios at 1.4 cpp so you will get $6300 worth of miles. You can also buy 200000 pre bonus miles and trade at a 3:1 ratio for status points. So 300000 (with bonus) you will get 20000 status points and you can convert 3:1 to status points so you got 120k status points and that is more than platinum status. That is all.