I didnt know they made a 1999 royal star venture - I had to google it - its got that big "alien head" fairing on it.
I know someone that has a 1999 Royal Star cruiser with only 1,600 miles on it, and he is thinking of selling it. I told him to call me if he does.
The V4 is a great engine. With 52K miles its a bit more than half used up, so I would expect a good price (less than $2,000) if the bike is in good shape, good maintenance records, newer tires, front shock oil seals replaced at some point... check the brakes and rotors.
But yeah, all in all if you find one in good condition they are a great machine.