Here I agreed mostly WoF which came through email expired after 48 hours, but these are not having expiring date which is also good and thousands of WoF are surely having some good amount of the things as well.
Yes, because the free WOF spins from email have an expiration date because they are free for all freebitcoin users who subscribe to the email, while the WOF spins given to FUN holders don't seem to expire, that's why many people collect as many WOF spins as they want and then play them all at once at a certain time so that hope to get more prizes or get the main prize.
Even though sometimes the results are not always satisfactory, in my opinion it doesn't matter if they want to save more as long as they want it, I have a different view from them, personally I prefer to play it every day because I think the reward in the form of satoshi will decrease when the price of bitcoin rises even though its value the same but the number of bitcoins will decrease, but it all comes back to each individual's wishes.