One of those, Milford Sound kayaking operator Rosco Gaudin, says he's owed between $5000 and $10,000.
''It's just bloody annoying — one thing I don't need on my plate at the moment.
''The liquidator says they're trying to onsell the business as a going concern, but whether or not anyone's going to buy it in this environment, I don't know.''
Queenstown Lakeview Holiday Park boss Peter Coppens, who's not owed any money, says they've used Whyte Waters for both its booking system and in-room promotional material.
''It was kind of an all-encompassing service that was quite good for local operators to use, like us.''
He notes a lot of activity providers are now only taking direct bookings.
Another booking system user, The Rees Hotel's Mark Rose, says ''I'm sure [Whyte Waters] is a Covid victim because all of their income would have just stopped, and New Zealanders book directly.''
Whyte Waters was set up by local councillor John MacDonald in 1995, but he exited the company in 2008.
It originally published visitor guides before starting up RTBS with an American company, he says.
The liquidation, he says, is ''very sad, but it's unusual times''.
''You would have said probably they were reasonably diverse, because they were online and they were print, but the whole sector shut down, everything stopped.''
The first report from Christchurch-based liquidator Rodgers Reidy is due October 1.
Mountain Scene wasn't able to contact Aitken for comment.