Even though FUN token price melted down and my investment went to almost 1/3 of its initial value (in BTC), I'm still making above 1% monthly profit (also in BTC), which gives a margin of at least 12% yearly, much superior to any investments offered by local banks and fiat deals in general.

It has been a sustainable source of income and the secret is to take advantage of the extra Bitcoin interest which is paid daily, reaching to 5.10% yearly. I lost count of my daily income progress, because the history doesn't register data from older periods of time, but after one and a half year of investment, I guess I have already made 25% ROI, that is calculated over the initial investment of 0.14611140 BTC which were used to acquire 487,038 FUN.
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- In average, you have paid 14,611,140 / 487,038 = 30 satoshi per FUN Token that would cost today 14 satoshi per FUN, that would be sellable by either 12 satoshi in Freebitco or by 13 Satoshi in some Exchanges.

- Taking into account implicit discounts of quantity and the variations of BTC price, I can guess that your mental accounting of " 1/3 of its initial value (in BTC)" is correct and that is no surprise after reading a few posts in this dedicated thread.

Nevertheless,

"extra Bitcoin interest which is paid daily" due to premium signature isn't up to 5.10% yearly - every regular user is entitled to 4.08% immediatly after signup and without having bought Premium requisites that, later, will lead to 5.10%