Opinion on offering 17k over list on a 90k property

[Matt Vanden Toorn]

I put an offer in on a property yesterday (same day it was listed) for asking price. Asking price was basically the same as the zestimate and the house was turn key. Today everything seems good - sellers agent contacted my bank to ensure profile/pre-approval. They told me we'd know by the end of the day. An hour later they get an offer for 17k over list. Why would someone do that? I understand over list, but 17k on a house listed at 90k?!? Is there a strategy they're using for securing homes that I could be utilizing? (Aside from the obvious of throwing stupid money at a property) Ie. Make the offer seem extreme and then when the house doesn't appraise, renegotiate?