From city-data.com's data on Detroit:
All numbers are per 100,000 residents, anually:
Murders: 46
Rapes: 40
Robberies: 763
Assaults: 1440
Burglaries: 2060
Thefts: 2430
Auto Thefts: 2280
Arson: 88
Aggregating "stealing" crimes, gets you 8,970 or about 9% chance per year. Adjust this for being "those rich dudes from out of town with all that electronic stuff" coupled with the $100 houses not being in the better parts of Detroit and I recommend good offsite backups and a personal philosophy that does not form attachments to material possessions.