You will notice that suction side cleaners are the cheapest, ranging from $100 to $300

Pressure side cleaners are in the $300 to $800 range especially if they have booster pumps.

Robotics start at $800 and generally go up to $1800, though for commercial grade ones the sky's the limit.

So the popularity of the cleaners directly parallels their cost inversely--the more expensive, the fewer are sold, regardless of AG/IG.