Not sure I understand your question. Selling online is a great way to target customers worldwide - instead of being held within a local area.
If your online business can help support your overhead - then by all means. Most retailers or even manufacuters have online sites to support their brink and mortar businesses - look at walmart online or target online, etc.
But, if your doing an online site that is not related to your core business just to bring in revenue - you are wasting your time and should focus on growing your core business. If you cannot grow your core business but find success online - then your core business should be the online business.
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