Boxcutters are useful both for opening packages and settling scores. But I wouldn't need to use one if packaging tape could be opened on its own, and if deadbeats would pay me my money on time.
Design can't do anything about the latter situation, but it can solve the former. Rip Cord, a concept currently under development at Quirky, is a brilliant idea for packaging tape whereby a string is embedded along the tape's centerline.
The serrated blade on the dispenser kicks out in the middle, providing a tabbed area you can pull up with a fingernail.
Then you just grab hold of the string, and zzzzzip the tape open.
Simple, smart, and far easier than trying to squeeze the vig out of degenerate debtors.