I got the email too. It explains that Amazon continues to operate as a loss leader (selling at prices that don't allow the company to make a profit in order to try to destroy the competition) and this makes it hard for other booksellers to stay in business.
Actually, Amazon doesn't post any accounting profit, but that doesn't imply that they are a loss leader. In fact if you look at their cash flow statement, they post massive cash inflows from operations. Accounting profit and loss is affected by many things such as depreciation, amortization, derivative cash flow hedges, foreign currency transaction gains & losses, cost structure, and on and on and on; much of which has little to nothing to do with sales expenses and is very different than the general notion of what profit is.
Not to hijack this thread, but I found their email to be grossly illiterate and misleading about these financial issues. Further to base their pitch for donations on this faulty information is irresponsible. We should expect that none other than the Westminster bookstore would exercise some due diligence before sending this email. I currently have a strongly worded letter typed up to the director about this, but I'm waiting until tomorrow to send it; perhaps some sleep will convince me to make it less strongly worded in the morning.
Still, I won't be giving to them until this is cleared up.