Are askings typically that unrealistic that a 1/2 price offer with 70% owner financing (typical around here) might get accepted?

(Des Moines is an area on my radar)   for example https://www.redfin.com/WA/Des-Moines/403-S-192nd-St-98148/home/338852  has been on the market a while so a semi-aggressive offer would not be an unrealistic move, though its probably on the "habitable fixer" end of things and I understand that with a child in school you may be a lot more selective about location,  neighborhood area etc.