Macbeth's financial boost

Before closing the posts on Macbeth, I would like to cite a couple sources that give a reason for the theatrical superstitions on the Scottish Play, here is the first:
http://www.angelfire.com/fl3/Defymcbeth/Super2.html

The superstition actually began in the old days of stock companies, which would struggle at all times to remain in business. Frequently, near the end of a season a stock company would realize that it was not going to break even and, in an attempt to boost ticket sales and attendance, would announce production of a crowd favorite . . . MacBeth.


If times were particularly bad, even 'the bard's play' would not be enough to save the company, therefore, MacBeth often presaged the end of a company's season, and would frequently be a portent of the company's demise.Therefore, the fear of MacBeth was generally the fear of bad business and of an entire company being put out of work.