I don't know who you mean by small business owner. I am sure high end small business owners(coffee shops, bars, night clubs) will eat it up and agree with it. I am talking about taco truck, etc.
If there are many transactions/customers, which would be cost effective for the SBO, the data usage might go over the limit, and I am sure ATT/Verizon will have something up their sleeve to over charge(apart from the $30/month) which would make this less appealing, apart from the already high transaction cost.