One of the core things is the levelling up prizes as well, all and all there is value to be had ---- also important to note that tower gold does allow a pathway to real money prizes, through fortune pot and during special events so although it's just a in-game currency it has some value in of it's self
Bobstone
Tower.bet live support
The tower gold has indeed some benefits and you can win real cash with it, so that is always nice. But I still think that the free spin can be made more interesting by just adding some other crypto even if the chance to win these is low.
The levelling up prizes can be high for the higher ranks, but it needs a lot of wager. I wagered a total of 0.005 BTC (when the prizes for BTC were lower than today), and currently I have around 5200 XP with a level up reward of 0.23$ in total. The level up rewards however seem to have increased a bit.