I'd like to think that Groupon effectively minimizes such temptations by its participating businesses, because it would impact Groupon's long term reputation and therefore viability.
....I'd hope the Department of Consumer Affairs would play a role too.
I am under the impression that businesses "in trouble" use Groupon as a desperate attempt to expand their customer base. The "deep discounts" cause them lose money in the short run, but they hope to get it back in the form of longterm customers.
Regardless her motivation for using Groupon, in this instance, I think the owner of Kelso judged her prospects correctly:
-The present neighborhood was/is not willing to support her business to the degree that she could pay the renewal rent. She was wise to minimize her losses (maximize her profits?) and close.
From what I have heard, Kelso was open since the late 60s, and has changed owners a few times. I'm not sure how long she owned it, but I hope her next venture is as (or more) profitable then this was.
One certainly needs a lot of investment capital and management skill to open a business and effectively compete on Franklin Avenue.
The change on Nostrand will make the one on Franklin look minor