Mistakes in terms of them being bad domains? If that's the case they probably won't sell at auction anyway, so I wouldn't put too much effort into it. Better to focus on the domains which were not mistakes.I'm new to this, and feel I've already made some mistakes and bought domains I shouldn't have
There's always a chance of finding a 'greater fool', which is why I thought I'd try an auction to see what it's like and understand how it works. If the fees above are the only ones, there's little cost in trying, and I'd possibly learn something along the way.