I have seen people losing tens of bitcoins on gambling, literally millions of dollars. So if they are willing to lose millions on gambling, shouldn't be weird to invest a few bitcoins on fun tokens neither.
Would be logical comparatively, the cashback on million or more would be over 10k a very nice bonus given for what you'd do anyway. I'll never get a 'free' 10k because I'm not gambling that amount but if you are then the cashback bonus is literally worth more which supports the FUN token price itself.
I always figured the token price has some support coming from its reflection of ongoing gambling, it does make sense to hold some. None of the tiers immediately give this bonus but I would characterize top tier as relatively generous for giving 70% of the total benefit within only 30 days.
I also think that the top tier is actually generous but to get there you need to spend at least almost 0.20 Bitcoin if you buy FUN token with the actual price and that is no small amount,hence the reason we see very few people at the top tier.I once dreamed of going there but max I got was 15% of that amount and even so I sold most of my FUN tokens for profit because I did buy them at 22-27 Satoshi and sold for 37-38 Satoshi making good profit.Now I keep the balance on Freebitco.in to earn daily interest which can accumulate nicely every day,I can buy FUN tokens with that if I want so far is near 10 FUN tokens daily or 300 monthly,if I add another 5 most likely from my daily WoF spins then it is 450 monthly or 15 daily.What I want to say is that interest plays a big role in helping you accumulate more and more FUN or making you generally better stats in the site.