But the sarcasm is ill-founded since it's Doha. The best may be there but they're not AT their best.
If that was a general argument for sports there'd be no reason for neither fans och players to care about the early months of the NBA, NHL, NFA etc.
Diamond League points counts the same for all meets over the season, well, except the last and final, but no-one has ever won the DL for his/her event without picking up at least some points somewhere earlier in the season.
And as for being at their best early, almost every year there has been a break through guy making his mark in the first meets, and with the africans not generally having the financial back-up of Mo and other Nike athlets, i.e for which the DL money is important in a way it isn't to him, I can assure you there's gonna be guys there who really ARE at their best.
Whether or not they can maintain that best over the whole season is a completely different question. Gebrhiwot break through early season world class dominance and late season championship fading two years ago easily comes to mind...