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Currently, the 750/zen cap ensure one can gain 750k AD at 1000 zen ($10).
Therefore many $10 items are priced for at least 750k in AH.

Over time, the items have become more expensive due to low supply and high demand.
Paid players will not want to trade 1000 zen for 750k AD. They could buy the item from Zen store, sell and profit in AH.
As a result, the AD to Zen convert system hardly benefit free players.
They have millions of AD to sell for Zen, but a buyer can take over half a year to surface.

To solve the problem, raising the cap to be above 750k to 1500k might do the trick.
Paid players could earn more AD with the system than to use AH. There will now be many AD buyers.
It is a win-win strategy because paid players get more AD instantly and more importantly,
free players can now earn Zen, solving the pay to win reputation once and for all.

However, will this eventually cause the price of items to raise in the long run?
A once affordable 750k item (1 week of saving for free players) might cost 1.5m very soon.
The free player made a lot less zen due to higher convert ratio as well.

I'm not an economy student, wish to hear your opinion if the cap is changed to 1500 with your trade experience.