Trust me, it's about market size.
To recoup on total costs you need to sell several hundred thousand units, or at least many tens of thousands.
Now consider the size of the Amiga market. If an Amiga model sells well it'll sell a few thousand units. On a really good return you may get a quarter of that buying your game. Launch products are made where the projected sales are at least a million these days.
As you can see, getting a game made specifically for the Amiga is suicide. Your only hope is getting a company to port from the Mac on the cheap (no DirectX), and even then you are talking tens of thousands quite possibly.
In other words, it's just not viable for a niche platform to have games written professionally.
Also, there is no proper developers environment like MSDev or even Eclipse.
Plus, the fact is that all our hardware is very slow these days, when compared to x86 Macs and PCs.
There is no way I'm afraid you will be able to use your x1000 for gaming unless it homebrew or open source, same as every other amigaoid platform.