Yes, it is possible.
Guide to Win Auction in Enterpriston
You can win auction Enterpriston without loan if you will have at least 15001 coins. It will unlock few unique dialogues. You need grind a lot in fisrt shop to get so many money. The most easy (but time consuming) way:
- Sell anything until Batnik get 5 lv.
- Buy 999 coffee.
- Keep game afk.
- Collect money from Batnik.
- repeat 2-4 until you collect 15001 coins.