Another major difference is these manufacturers cannot achieve the economy of scale a commercial golf range finder can.
Being able to make a few million units a years vs a few thousand. All adds up.
COTS
12.7mm or 50CAL can easily reach up to 1500m in effective range. I don't see an golf range finders capable of reaching beyond 3-400 yards, since golf course rarely have a straight away or line of sight that far. So you are unlikely to find a comparable commercial model.
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Purpose
If you missed a shot, you might not win the golf tournament, but if you misidentified a target and shot up some non-combatants, then the repercussions and penalties are vastly higher.
RWS have 2-3 primary purpose:
1. Leave the operator in the hull/chassis to provide ballistic protection.
2. Depending on the caliber, provide immediate security to the vehicle. Such as the rear RWS on Marder.
3. Provide offensive capability through sensor integration.
1 and 2 can mostly be achieved with low end COTS. 3rd goal will have to use some high end sensor, ballistic and sensor solutions.
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Application
RWS are mostly used in MOUT and urban operations. If the intent is for high intensity peer level fight, then RWS might not be that relevant/useful.