We have an LBS that got robbed last summer (perp grabbed a bike from out front and took off). Store owner took off after him in the shop van. Perp ended up in an open field, dropped the bike and ran. That didn't stop the owner though. He stopped the van and got out and chased the perp down on foot. Finally caught him and took him down. Several women who witnessed the foot chase came running up with twine and belts and helped secure the perp. The owner ws quite proud of himself. Perp went to jail.
Owner now locks bikes that are out front. Also has security cameras inside (always has). Has locking bars over the windows that are closed after hours. His shop is in a questionable part of town (every city seems to have one). Does good enough business that he opened another shop.
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'84 Trek 850--spinbackle-built, '85 Trek 670 Campy Nuovo Record--project, '87 Trek 560 SS/Fixed--project, '87 Specialized Stumpjumper Comp w/ Deore XT--Specialized-built, '87 Rossin Record, '03 LeMond Wayzata--commuter,
'?? TST Mtn Bike frame--project, '07 Tsunami Tandem--home-built