Yes the commercial remote controlled mowers have been pricey; $5k for a lawn mower size mower, and the larger ones seem to be PT-1860 cost, for not a lot of utility. E.g. this one
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While this claims up to 50 degree slopes, the Kawasaki FX1000V has a limitation of 25 degrees. There's no claim for an enlarge oil pan or dry sump, or nothing that might help the Kawasaki run well, but perhaps it is a man behind the curtain thing...It lists new for more than an 1860.
All the best,
Peter