Originally Posted by ozza
This isn't actually true. ATP Dubai never really has had a better field than ATP Monte Carlo (who only really Federer skips these days). It's because if you make these events non-mandatory, they will buy up the top players, but you end up with a really lopsided field where it will have like a couple of players ranked between about 10-40 because these players aren't getting paid to play there, and know with say the top 4 in the world playing that they have no chance of winning, and the prize money isn't enough to entice them.
ATP Dubai does just as much as it needs to promote ATP in Middle East. They have most of top 10, and nobody there cares about #11-40. It's almost a non-mandatory "Masters 500" but it leaves one more Masters 1000 in Europe where it's cheaper for non-top10 players to travel to. WTA could do the same with Doha.