1) Change of mind
2) Testing the market
3) Sobered up and realize they made some drunk dialing mistake.
4) Spouse or SO found out about the purchase and nixed it.
5) Another better deal came up.
As to why they bother bidding in the first place:
1) Boredom
2) Loneliness
3) Obsessive/Compulsive behavior
4) Depression
5) Excitement (a la gambling)
6) Mind altering drugs (including alcohol)
2) Testing the market
3) Sobered up and realize they made some drunk dialing mistake.
4) Spouse or SO found out about the purchase and nixed it.
5) Another better deal came up.
As to why they bother bidding in the first place:
1) Boredom
2) Loneliness
3) Obsessive/Compulsive behavior
4) Depression
5) Excitement (a la gambling)
6) Mind altering drugs (including alcohol)