Nope. As much as I agree the 20 hour collection time is one of the dumbest ideas gree has come out with I, as well as many others, are doing it for the items. I normally buy 2 of every ltb but that stopped with the Still. Thinking about this one now too.
I usually get these buildings to 7 or 8 before the event ends. Have yet to spend any real money on them either!