I have a story to tell.
My town is actually one day ahead of the actual date due to a mistake in setting my 3DS clock. I never bothered to fix it, but that meant yesterday was my last day for turnips.
I purchased 500,000 worth of turnips. I bought fairly high, at 106, so I wanted to make a good profit. Wednesday (my Thursday) rolled around and it was 155. I thought it was good but I had hoped for something a little higher on Friday, so I waited.
Friday came. Prices were 47.
Uh oh.
I begin to panic but hold fast. Maybe Saturday will reveal a final clutch price close to what I paid and I'll at least walk away having lost nothing.
Saturday comes. Price is 34. ACK.
Full panic mode. I message my friends and fortunately one friend has a turnip price of 147. I whisk on over to her town, sell my huge turnip stock for a tidy profit, and head on home, relived.
Moral of the story: If you are gonna make like 50% profit on turnips do not turn it down, ya greedy bastard.