So when would the bunkers be raked? Unless the answer is "Never!" it sort of becomes an unworkable solution to a problem that doesn't really exist anyway, doesn't it? If the bunkers are in good shape for the first group out in the morning, and then increasingly worse all day, whether we're talking about on Tour or at the local goat ranch, there is an equity issue there.
Also, I think what is being missed in the discussion of the sand save percentage of pros is WHICH bunkers they find themselves in relative to that day's pin position. Being a better ball-striker doesn't just mean that you hit more greens; it also means that you miss in places where you can get up and down. There are bunkers that you just don't see Tour players come close to, and there are bunkers that they prefer to the rough, and that can vary day to day according to the pin.
In other words, that the top Tour players get up and down from the sand 50% of the time says as much about how well they control their misses as it does their sand play and putting.