For all the haters on this thread, how would you feel if the OP's question was reframed thus:
"how many guns in one house are enough?"

The company is and should be free to lose money by oversaturating the market if they want. Many companies have done so in the past and suffered the repercussions. "How much is enough" is a question that should be decided solely by the economics of the situation and then only by the person or company that stands to make or lose money.