I signed up for a fandom auction last year with two offers: one was won by a person I 'knew' from exchanges (we'd never interacted much outside of AO3 comments, but they knew the sort of stuff I wrote and basically prompted for 'more of this rarepair, please') and the other was won by a person who'd e-mailed me about what they wanted before bidding.

(In my offer, I'd said something like 'please feel free to contact me to ask about specific fandoms/ships/prompts' which may have helped. I'll also second enemytosleep's advise, because yikes. Theirs does not sound like a fun experience.)