Trees, you'll can't just ignore the other state laws. For example, you must usually follow the unclaimed property laws of the state where your customer lives, however, if your home state has reciprocity agreements with other states it might make your job easier.
Also, different states have privacy breach disclosure laws related to their citizens. In other words, if you have a security breach requiring customer notification, you better make sure you're OK for each state where the affected customers live.
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"If you want to tell people the truth, make them laugh, otherwise they'll kill you." ~ Oscar Wilde